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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [or32/] [kernel/] [head.S] - Rev 1765
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/** linux/arch/or32/kernel/head.S** or32 version* author(s): Matjaz Breskvar (phoenix@opencores.org)** changes:* 18. 11. 2003: Matjaz Breskvar (phoenix@opencores.org)* initial port to or32 architecture* 06. 12. 2003: Matjaz Breskvar (phoenix@opencores.org)* major changes in handling exceptions* physical addresses used only by code in head.S* cleand exception handlers and moved them to entry.S*/#include <linux/config.h>#include <linux/threads.h>#include <linux/errno.h>#include <asm/processor.h>#include <asm/page.h>#include <asm/mmu.h>#include <asm/pgtable.h>#include <asm/cache.h>#include <asm/or32_asm.h>#include <asm/spr_defs.h>#include <asm/board.h>/* some defines to ease or32 assembly programming */#include "or32_defs.h"#include "or32_funcs.S"#define DRAM_END (PAGE_OFFSET+CONFIG_OR32_MEMORY_SIZE)#if defined(CONFIG_OR32_ICACHE_ENABLED) && defined(CONFIG_OR32_DCACHE_ENABLED)# define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_DCE | SPR_SR_ICE | SPR_SR_SM)#elif defined(CONFIG_OR32_ICACHE_ENABLED) && !defined(CONFIG_OR32_DCACHE_ENABLED)# define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE | SPR_SR_SM)#elif defined(CONFIG_OR32_DCACHE_ENABLED) && !defined(CONFIG_OR32_ICACHE_ENABLED)# define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_DCE | SPR_SR_SM)#else# define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_SM)#endif#undef CONFIG_DMMU_WORKS#define CONFIG_DMMU_WORKS 1#undef CONFIG_IMMU_WORKS#define CONFIG_IMMU_WORKS 1#undef CONFIG_OR32_EXCEPTION_REGENERATE//#define CONFIG_OR32_EXCEPTION_REGENERATE 1#undef CONFIG_OR32_EXCEPTION_DEBUG//#define CONFIG_OR32_EXCEPTION_DEBUG 1#undef DEBUG_TLB_EXCEPTIONS//#define DEBUG_TLB_EXCEPTIONS 1/* ============================================[ tmp store locations ]=== *//** workaround for passing next open ethernet tx buffer descriptor number* when used prior linux. for details look into drivers/net/open_eth.[ch]*/#define INIT_OETH_TX_NEXT 0x0/** inital configuration*/#define INIT_IC_ADDR 0x4#define INIT_DC_ADDR 0x8#define SF_DISABLED(reg,ADDR) l.lwz reg,ADDR(r0) ;\l.sfeqi reg,0x0#ifdef CONFIG_OR32_ICACHE_ENABLED# define INIT_CONFIG_ICACHE(reg) l.ori reg,r0,1 ;\l.sw INIT_IC_ADDR(r0),reg#else# define INIT_CONFIG_ICACHE(reg) l.ori reg,r0,0 ;\l.sw INIT_IC_ADDR(r0),reg#endif#ifdef CONFIG_OR32_DCACHE_ENABLED# define INIT_CONFIG_DCACHE(reg) l.ori reg,r0,1 ;\l.sw INIT_DC_ADDR(r0),reg#else# define INIT_CONFIG_DCACHE(reg) l.ori reg,r0,0 ;\l.sw INIT_DC_ADDR(r0),reg#endif/** emergency_print temporary stores*/#define EMERGENCY_PRINT_STORE_GPR4 l.sw 0x20(r0),r4#define EMERGENCY_PRINT_LOAD_GPR4 l.lwz r4,0x20(r0)#define EMERGENCY_PRINT_STORE_GPR5 l.sw 0x24(r0),r5#define EMERGENCY_PRINT_LOAD_GPR5 l.lwz r5,0x24(r0)#define EMERGENCY_PRINT_STORE_GPR6 l.sw 0x28(r0),r6#define EMERGENCY_PRINT_LOAD_GPR6 l.lwz r6,0x28(r0)#define EMERGENCY_PRINT_STORE_GPR7 l.sw 0x2c(r0),r7#define EMERGENCY_PRINT_LOAD_GPR7 l.lwz r7,0x2c(r0)#define EMERGENCY_PRINT_STORE_GPR8 l.sw 0x30(r0),r8#define EMERGENCY_PRINT_LOAD_GPR8 l.lwz r8,0x30(r0)#define EMERGENCY_PRINT_STORE_GPR9 l.sw 0x34(r0),r9#define EMERGENCY_PRINT_LOAD_GPR9 l.lwz r9,0x34(r0)/** EXCEPTION_DEBUG temporary stores*/#define EXCEPTION_DEBUG_STORE_GPR3 l.sw 0x40(r0),r3#define EXCEPTION_DEBUG_LOAD_GPR3 l.lwz r3,0x40(r0)#define EXCEPTION_DEBUG_STORE_GPR4 l.sw 0x44(r0),r4#define EXCEPTION_DEBUG_LOAD_GPR4 l.lwz r4,0x44(r0)#define EXCEPTION_DEBUG_STORE_GPR9 l.sw 0x48(r0),r9#define EXCEPTION_DEBUG_LOAD_GPR9 l.lwz r9,0x48(r0)#define EXCEPTION_DEBUG_STORE_F_GPR9 l.sw 0x4c(r0),r9#define EXCEPTION_DEBUG_LOAD_F_GPR9 l.lwz r9,0x4c(r0)/** EXCEPTION_REGENERATE temporary stores*/#define E_REGEN_STORE_STATUS(reg) l.sw 0x50(r0),reg#define E_REGEN_LOAD_STATUS(reg) l.lwz reg,0x50(r0)#define E_REGEN_STORE_GPR3 l.sw 0x54(r0),r3#define E_REGEN_LOAD_GPR3 l.lwz r3,0x54(r0)#define E_REGEN_STORE_GPR4 l.sw 0x58(r0),r4#define E_REGEN_LOAD_GPR4 l.lwz r4,0x58(r0)#define E_REGEN_STORE_GPR5 l.sw 0x5c(r0),r5#define E_REGEN_LOAD_GPR5 l.lwz r5,0x5c(r0)#define E_REGEN_STORE_GPR6 l.sw 0x60(r0),r6#define E_REGEN_LOAD_GPR6 l.lwz r6,0x60(r0)#define E_REGEN_STORE_GPR9 l.sw 0x14(r0),r9#define E_REGEN_LOAD_GPR9 l.lwz r9,0x14(r0)/** TLB miss handlers temorary stores*/#define EXCEPTION_STORE_GPR9 l.sw 0x10(r0),r9#define EXCEPTION_LOAD_GPR9 l.lwz r9,0x10(r0)#define EXCEPTION_STORE_GPR2 l.sw 0x64(r0),r2#define EXCEPTION_LOAD_GPR2 l.lwz r2,0x64(r0)#define EXCEPTION_STORE_GPR3 l.sw 0x68(r0),r3#define EXCEPTION_LOAD_GPR3 l.lwz r3,0x68(r0)#define EXCEPTION_STORE_GPR4 l.sw 0x6c(r0),r4#define EXCEPTION_LOAD_GPR4 l.lwz r4,0x6c(r0)#define EXCEPTION_STORE_GPR5 l.sw 0x70(r0),r5#define EXCEPTION_LOAD_GPR5 l.lwz r5,0x70(r0)#define EXCEPTION_STORE_GPR6 l.sw 0x74(r0),r6#define EXCEPTION_LOAD_GPR6 l.lwz r6,0x74(r0)/** EXCEPTION_HANDLE temporary stores*/#define EXCEPTION_T_STORE_GPR31 l.sw 0x78(r0),r31#define EXCEPTION_T_LOAD_GPR31(reg) l.lwz reg,0x78(r0)#define EXCEPTION_T_STORE_GPR2 l.sw 0x7c(r0),r2#define EXCEPTION_T_LOAD_GPR2(reg) l.lwz reg,0x7c(r0)#define EXCEPTION_T_STORE_SP l.sw 0x80(r0),r1#define EXCEPTION_T_LOAD_SP(reg) l.lwz reg,0x80(r0)/** UNHANDLED_EXCEPTION temporary stores*/#define UNH_EXCEPTION_T_STORE_GPR31 l.sw 0x84(r0),r31#define UNH_EXCEPTION_T_LOAD_GPR31(reg) l.lwz reg,0x84(r0)#define UNH_EXCEPTION_T_STORE_GPR2 l.sw 0x88(r0),r2#define UNH_EXCEPTION_T_LOAD_GPR2(reg) l.lwz reg,0x88(r0)#define UNH_EXCEPTION_T_STORE_SP l.sw 0x8c(r0),r1#define UNH_EXCEPTION_T_LOAD_SP(reg) l.lwz reg,0x8c(r0)/* =========================================================[ macros ]=== */#define GET_CURRENT(reg,t1) \LOAD_SYMBOL_2_GPR(reg,_current_set) ;\tophys (t1,reg) ;\l.lwz reg,0(t1)#define GET_CURRENT_PGD(reg,t1) \LOAD_SYMBOL_2_GPR(reg,_current_pgd) ;\tophys (t1,reg) ;\l.lwz reg,0(t1)#if defined(CONFIG_OR32_EXCEPTION_DEBUG) && defined(CONFIG_OR32_EXCEPTION_REGENERATE)# define EXCEPTION_DEBUG \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.mfspr r4,r0,SPR_PC ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_VALUE(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.addi r4,r0,value ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_ER \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.mfspr r4,r0,SPR_PC ;\l.jal _exception_regenerate ;\l.nop ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_VALUE_ER(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.addi r4,r0,value ;\l.jal _exception_regenerate ;\l.nop ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9#elif !defined(CONFIG_OR32_EXCEPTION_DEBUG) && defined(CONFIG_OR32_EXCEPTION_REGENERATE)# define EXCEPTION_DEBUG# define EXCEPTION_DEBUG_VALUE(value)# define EXCEPTION_DEBUG_ER \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_regenerate ;\l.nop ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_VALUE_ER(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_regenerate ;\l.nop ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9#elif defined(CONFIG_OR32_EXCEPTION_DEBUG) && !defined(CONFIG_OR32_EXCEPTION_REGENERATE)# define EXCEPTION_DEBUG \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.mfspr r4,r0,SPR_PC ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_VALUE(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.addi r4,r0,value ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_ER \EXCEPTION_DEBUG# define EXCEPTION_DEBUG_VALUE_ER(value) \EXCEPTION_DEBUG_VALUE(value)#else# define EXCEPTION_DEBUG# define EXCEPTION_DEBUG_VALUE(value)# define EXCEPTION_DEBUG_ER# define EXCEPTION_DEBUG_VALUE_ER(value)#endif# define EXCEPTION_DEBUG_VALUE_ER_ENABLED(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.addi r4,r0,value ;\l.jal _exception_regenerate ;\l.nop ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9# define EXCEPTION_DEBUG_VALUE_ENABLED(value) \EXCEPTION_DEBUG_STORE_GPR4 ;\EXCEPTION_DEBUG_STORE_F_GPR9 ;\l.jal _exception_debug ;\l.addi r4,r0,value ;\EXCEPTION_DEBUG_LOAD_GPR4 ;\EXCEPTION_DEBUG_LOAD_F_GPR9#ifdef DEBUG_TLB_EXCEPTIONS# define DEBUG_TLB_PROBE(value) \EXCEPTION_DEBUG_VALUE_ENABLED(value)#else# define DEBUG_TLB_PROBE(value)#endif/** DSCR: this is a common hook for handling exceptions. it will save* the needed registers, set up stack and pointer to current* then jump to the handler while enabling MMU** PRMS: handler - a function to jump to. it has to save the* remaining registers to kernel stack, call* appropriate arch-independant exception handler* and finaly jump to ret_from_except** PREQ: unchanged state from the time exception happened** POST: SAVED the following registers original value* to the new created exception frame pointed to by r1** r1 - ksp pointing to the new (exception) frame* r2 - current pointing to current process struct* r4 - EEAR exception EA* r12 - syscall 0, since we didn't come from syscall* r13 - temp it actually contains new SR, not needed anymore* r31 - handler address of the handler we'll jump to** handler has to save remaining registers to the exception* ksp frame *before* tainting them!** NOTE: this function is not reentrant per se. reentrancy is guaranteed* by processor disabling all exceptions/interrupts when exception* accours.** OPTM: no need to make it so wasteful to extract ksp when in user mode*/#define EXCEPTION_HANDLE(handler) \EXCEPTION_DEBUG ;\EXCEPTION_T_STORE_GPR31 ;\EXCEPTION_T_STORE_GPR2 ;\EXCEPTION_T_STORE_SP ;\l.mfspr r31,r0,SPR_ESR_BASE ;\l.andi r31,r31,SPR_SR_SM ;\l.sfeqi r31,0 ;\l.bnf 2f /* kernel_mode */ ;\l.nop ;\1: /* user_mode: */ ;\LOAD_SYMBOL_2_GPR(r1,_current_set) ;\tophys (r31,r1) ;\/* r2: current */ ;\l.lwz r2,0(r31) ;\tophys (r31,r2) ;\l.lwz r1,(THREAD+THREAD_KSP)(r31) ;\/* fall through */ ;\2: /* kernel_mode: */ ;\/* create new stack frame, save only needed gprs */ ;\/* r1: KSP, r2: current, r4: EEAR, r31: __pa(KSP) */ ;\/* r12: temp, syscall indicator, r13 temp */ ;\l.addi r1,r1,-(INT_FRAME_SIZE) ;\/* r1 is KSP, r31 is __pa(KSP) */ ;\tophys (r31,r1) ;\l.sw GPR12(r31),r12 ;\l.mfspr r12,r0,SPR_EPCR_BASE ;\l.sw PC(r31),r12 ;\l.mfspr r12,r0,SPR_ESR_BASE ;\l.sw SR(r31),r12 ;\/* save r31 */ ;\EXCEPTION_T_LOAD_GPR31(r12) ;\l.sw GPR31(r31),r12 ;\/* save r2 as was prior to exception */ ;\EXCEPTION_T_LOAD_GPR2(r12) ;\l.sw GPR2(r31),r12 ;\/* save SP as was prior to exception */ ;\EXCEPTION_T_LOAD_SP(r12) ;\l.sw SP(r31),r12 ;\l.sw GPR13(r31),r13 ;\/* save exception r4, set r4 = EA */ ;\l.sw GPR4(r31),r4 ;\l.mfspr r4,r0,SPR_EEAR_BASE ;\/* r12 == 1 if we come from syscall */ ;\CLEAR_GPR(r12) ;\/* ----- turn on MMU ----- */ ;\l.addi r31,r0,(EXCEPTION_SR) ;\l.mtspr r0,r31,SPR_ESR_BASE ;\/* r31: EA address of handler */ ;\LOAD_SYMBOL_2_GPR(r31,handler) ;\l.mtspr r0,r31,SPR_EPCR_BASE ;\l.rfe/** this doesn't work*** #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION* #define UNHANDLED_EXCEPTION(handler) \* l.ori r3,r0,0x1 ;\* l.mtspr r0,r3,SPR_SR ;\* l.movhi r3,hi(0xf0000100) ;\* l.ori r3,r3,lo(0xf0000100) ;\* l.jr r3 ;\* l.nop 1** #endif*//* DSCR: this is the same as EXCEPTION_HANDLE(), we are just* a bit more carefull (if we have a SP or current pointer* corruption) and set them up from 'current_set'**/#define UNHANDLED_EXCEPTION(handler) \EXCEPTION_DEBUG ;\EXCEPTION_T_STORE_GPR31 ;\EXCEPTION_T_STORE_GPR2 ;\EXCEPTION_T_STORE_SP ;\/* temporary store r3, r9 into r1, r2 */ ;\l.addi r1,r3,0x0 ;\l.addi r2,r9,0x0 ;\/* the string referenced by r3 must be low enough */ ;\l.jal _emergency_print ;\l.ori r3,r0,lo(_string_unhandled_exception) ;\l.mfspr r3,r0,SPR_PC ;\l.jal _emergency_print_nr ;\l.andi r3,r3,0x1f00 ;\/* the string referenced by r3 must be low enough */ ;\l.jal _emergency_print ;\l.ori r3,r0,lo(_string_epc_prefix) ;\l.jal _emergency_print_nr ;\l.mfspr r3,r0,SPR_EPCR_BASE ;\l.jal _emergency_print ;\l.ori r3,r0,lo(_string_nl) ;\/* end of printing */ ;\l.addi r3,r1,0x0 ;\l.addi r9,r2,0x0 ;\/* extract current, ksp from current_set */ ;\LOAD_SYMBOL_2_GPR(r1,_unhandled_stack_top) ;\LOAD_SYMBOL_2_GPR(r2,_init_task_union) ;\/* create new stack frame, save only needed gprs */ ;\/* r1: KSP, r2: current, r31: __pa(KSP) */ ;\/* r12: temp, syscall indicator, r13 temp */ ;\l.addi r1,r1,-(INT_FRAME_SIZE) ;\/* r1 is KSP, r31 is __pa(KSP) */ ;\tophys (r31,r1) ;\l.sw GPR12(r31),r12 ;\l.mfspr r12,r0,SPR_EPCR_BASE ;\l.sw PC(r31),r12 ;\l.mfspr r12,r0,SPR_ESR_BASE ;\l.sw SR(r31),r12 ;\/* save r31 */ ;\EXCEPTION_T_LOAD_GPR31(r12) ;\l.sw GPR31(r31),r12 ;\/* save r2 as was prior to exception */ ;\EXCEPTION_T_LOAD_GPR2(r12) ;\l.sw GPR2(r31),r12 ;\/* save SP as was prior to exception */ ;\EXCEPTION_T_LOAD_SP(r12) ;\l.sw SP(r31),r12 ;\l.sw GPR13(r31),r13 ;\/* --> */ ;\/* save exception r4, set r4 = EA */ ;\l.sw GPR4(r31),r4 ;\l.mfspr r4,r0,SPR_EEAR_BASE ;\/* r12 == 1 if we come from syscall */ ;\CLEAR_GPR(r12) ;\/* ----- play a MMU trick ----- */ ;\l.addi r31,r0,(EXCEPTION_SR) ;\l.mtspr r0,r31,SPR_ESR_BASE ;\/* r31: EA address of handler */ ;\LOAD_SYMBOL_2_GPR(r31,handler) ;\l.mtspr r0,r31,SPR_EPCR_BASE ;\l.rfe/* =====================================================[ exceptions] === *//* ---[ 0x100: RESET exception ]----------------------------------------- */.org 0x100l.ori r3,r0,0x1l.mtspr r0,r3,SPR_SR#ifdef CONFIG_OR32_FLASH_BOOTLOAD_SYMBOL_2_GPR(r3,0xf0000118) // jumps to the 'reset_start'l.jr r3l.nopreset_start:l.jal _mc_initl.nopl.jal _early_uart_initl.nopLOAD_SYMBOL_2_GPR(r4,_string_copying_linux)l.movhi r3,hi(0x30000000)l.add r3,r3,r4l.jal _emergency_printl.nop/** copy linux kernel image from flash to sdram*/LOAD_SYMBOL_2_GPR(r3,0xf0000000) // sourceLOAD_SYMBOL_2_GPR(r4,0x0) // destinationLOAD_SYMBOL_2_GPR(r6,__end) // last destinationtophys (r5,r6) // last destination/** copy %r3 to %r4 until %r4 == %r5*/2:l.sfgeu r4,r5l.bf 1fl.nopl.lwz r8,0(r3)l.sw 0(r4),r8l.addi r3,r3,4l.j 2bl.addi r4,r4,41:#else#if 0l.jal _mc_initl.nopl.jal _early_uart_initl.nop#endif#endif /* CONFIG_OR32_FLASH_BOOT */#if 0LOAD_SYMBOL_2_GPR(r4,_string_ok_booting)tophys (r3,r4)l.jal _emergency_printl.nop#endifLOAD_SYMBOL_2_GPR(r4, _start)tophys (r3,r4) // physical addressl.jr r3l.nop/* ---[ 0x200: BUS exception ]------------------------------------------- */.org 0x200_dispatch_bus_fault:UNHANDLED_EXCEPTION(_vector_0x200)/* ---[ 0x300: Data Page Fault exception ]------------------------------- */.org 0x300_dispatch_do_dpage_fault:// totaly disable timer interrupt// l.mtspr r0,r0,SPR_TTMR// DEBUG_TLB_PROBE(0x300)// EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x300)EXCEPTION_HANDLE(_data_page_fault_handler)/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */.org 0x400_dispatch_do_ipage_fault:// totaly disable timer interrupt// l.mtspr r0,r0,SPR_TTMR// DEBUG_TLB_PROBE(0x400)// EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x400)EXCEPTION_HANDLE(_insn_page_fault_handler)/* ---[ 0x500: Timer exception ]----------------------------------------- */.org 0x500EXCEPTION_HANDLE(_timer_handler)/* ---[ 0x600: Aligment exception ]-------------------------------------- */.org 0x600UNHANDLED_EXCEPTION(_vector_0x600)// EXCEPTION_HANDLE(_aligment_handler)/* ---[ 0x700: Illegal insn exception ]---------------------------------- */.org 0x700UNHANDLED_EXCEPTION(_vector_0x700)/* ---[ 0x800: External interrupt exception ]---------------------------- */.org 0x800EXCEPTION_HANDLE(_external_irq_handler)/* ---[ 0x900: DTLB miss exception ]------------------------------------- */.org 0x900l.j boot_dtlb_miss_handlerl.nop/* ---[ 0xa00: ITLB miss exception ]------------------------------------- */.org 0xa00l.j boot_itlb_miss_handlerl.nop/* ---[ 0xb00: Range exception ]----------------------------------------- */.org 0xb00UNHANDLED_EXCEPTION(_vector_0xb00)/* ---[ 0xc00: Syscall exception ]--------------------------------------- */.org 0xc00EXCEPTION_HANDLE(_sys_call_handler)/* ---[ 0xd00: Trap exception ]------------------------------------------ */.org 0xd00UNHANDLED_EXCEPTION(_vector_0xd00)/* ---[ 0xe00: Trap exception ]------------------------------------------ */.org 0xe00UNHANDLED_EXCEPTION(_vector_0xe00)/* ---[ 0xf00: Reserved exception ]-------------------------------------- */.org 0xf00UNHANDLED_EXCEPTION(_vector_0xf00)/* ---[ 0x1000: Reserved exception ]------------------------------------- */.org 0x1000UNHANDLED_EXCEPTION(_vector_0x1000)/* ---[ 0x1100: Reserved exception ]------------------------------------- */.org 0x1100UNHANDLED_EXCEPTION(_vector_0x1100)/* ---[ 0x1200: Reserved exception ]------------------------------------- */.org 0x1200UNHANDLED_EXCEPTION(_vector_0x1200)/* ---[ 0x1300: Reserved exception ]------------------------------------- */.org 0x1300UNHANDLED_EXCEPTION(_vector_0x1300)/* ---[ 0x1400: Reserved exception ]------------------------------------- */.org 0x1400UNHANDLED_EXCEPTION(_vector_0x1400)/* ---[ 0x1500: Reserved exception ]------------------------------------- */.org 0x1500UNHANDLED_EXCEPTION(_vector_0x1500)/* ---[ 0x1600: Reserved exception ]------------------------------------- */.org 0x1600UNHANDLED_EXCEPTION(_vector_0x1600)/* ---[ 0x1700: Reserved exception ]------------------------------------- */.org 0x1700UNHANDLED_EXCEPTION(_vector_0x1700)/* ---[ 0x1800: Reserved exception ]------------------------------------- */.org 0x1800UNHANDLED_EXCEPTION(_vector_0x1800)/* ---[ 0x1900: Reserved exception ]------------------------------------- */.org 0x1900UNHANDLED_EXCEPTION(_vector_0x1900)/* ---[ 0x1a00: Reserved exception ]------------------------------------- */.org 0x1a00UNHANDLED_EXCEPTION(_vector_0x1a00)/* ---[ 0x1b00: Reserved exception ]------------------------------------- */.org 0x1b00UNHANDLED_EXCEPTION(_vector_0x1b00)/* ---[ 0x1c00: Reserved exception ]------------------------------------- */.org 0x1c00UNHANDLED_EXCEPTION(_vector_0x1c00)/* ---[ 0x1d00: Reserved exception ]------------------------------------- */.org 0x1d00UNHANDLED_EXCEPTION(_vector_0x1d00)/* ---[ 0x1e00: Reserved exception ]------------------------------------- */.org 0x1e00UNHANDLED_EXCEPTION(_vector_0x1e00)/* ---[ 0x1f00: Reserved exception ]------------------------------------- */.org 0x1f00UNHANDLED_EXCEPTION(_vector_0x1f00).org 0x2000/* ===================================================[ kernel start ]=== */.text.global _stext_stext:.global _start_start:/** ensure a deterministic start*/l.ori r3,r0,0x1l.mtspr r0,r3,SPR_SRCLEAR_GPR(r1)CLEAR_GPR(r2)CLEAR_GPR(r3)CLEAR_GPR(r4)CLEAR_GPR(r5)CLEAR_GPR(r6)CLEAR_GPR(r7)CLEAR_GPR(r8)CLEAR_GPR(r9)CLEAR_GPR(r10)CLEAR_GPR(r11)CLEAR_GPR(r12)CLEAR_GPR(r13)CLEAR_GPR(r14)CLEAR_GPR(r15)CLEAR_GPR(r16)CLEAR_GPR(r17)CLEAR_GPR(r18)CLEAR_GPR(r19)CLEAR_GPR(r20)CLEAR_GPR(r21)CLEAR_GPR(r22)CLEAR_GPR(r23)CLEAR_GPR(r24)CLEAR_GPR(r25)CLEAR_GPR(r26)CLEAR_GPR(r27)CLEAR_GPR(r28)CLEAR_GPR(r29)CLEAR_GPR(r30)CLEAR_GPR(r31)/** set up initial ksp and current*/LOAD_SYMBOL_2_GPR(r1,_init_task_union+0x2000) // setup kernel stackLOAD_SYMBOL_2_GPR(r2,_init_task_union) // setup currentwrite_config:INIT_CONFIG_ICACHE(r3)INIT_CONFIG_DCACHE(r3)l.ori r4,r0,0x0E_REGEN_STORE_STATUS(r4) ///** .data contains initialized data,* .bss contains uninitialized data - clear it up*/clear_bss:LOAD_SYMBOL_2_GPR(r24, ___bss_start)LOAD_SYMBOL_2_GPR(r26, __end)tophys(r28,r24)tophys(r30,r26)CLEAR_GPR(r24)CLEAR_GPR(r26)1:l.sw (0)(r28),r0l.sfltu r28,r30l.bf 1bl.addi r28,r28,4enable_ic:l.jal _ic_enablel.nopenable_dc:l.jal _dc_enablel.nopflush_tlb:/** I N V A L I D A T E T L B e n t r i e s*/LOAD_SYMBOL_2_GPR(r5,SPR_DTLBMR_BASE(0))LOAD_SYMBOL_2_GPR(r6,SPR_ITLBMR_BASE(0))l.addi r7,r0,641:l.mtspr r5,r0,0x0l.mtspr r6,r0,0x0l.addi r5,r5,1l.addi r6,r6,1l.sfeq r7,r0l.bnf 1bl.addi r7,r7,-1enable_mmu:/** enable dmmu & immu* SR[5] = 0, SR[6] = 0, 6th and 7th bit of SR set to 0*/SR_ENABLE_BITS((SPR_SR_DME | SPR_SR_IME),r28,r30)l.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nop/** clear all GPRS to increase determinism*/CLEAR_GPR(r3)CLEAR_GPR(r4)CLEAR_GPR(r5)CLEAR_GPR(r6)CLEAR_GPR(r7)CLEAR_GPR(r8)CLEAR_GPR(r9)CLEAR_GPR(r10)CLEAR_GPR(r11)CLEAR_GPR(r12)CLEAR_GPR(r13)CLEAR_GPR(r14)CLEAR_GPR(r15)CLEAR_GPR(r16)CLEAR_GPR(r17)CLEAR_GPR(r18)CLEAR_GPR(r19)CLEAR_GPR(r20)CLEAR_GPR(r21)CLEAR_GPR(r22)CLEAR_GPR(r23)CLEAR_GPR(r24)CLEAR_GPR(r25)CLEAR_GPR(r26)CLEAR_GPR(r27)CLEAR_GPR(r28)CLEAR_GPR(r29)CLEAR_GPR(r30)CLEAR_GPR(r31)jump_start_kernel:/** jump to kernel entry (start_kernel)*/LOAD_SYMBOL_2_GPR(r30, _start_kernel)l.jr r30l.nop/* ========================================[ memory controler, cache ]=== */#if CONFIG_OR32_MC_VERSION==1ENTRY(_mc_init)l.movhi r3,hi(MC_BASE_ADD)l.ori r3,r3,lo(MC_BASE_ADD)l.addi r4,r3,MC_CSC(0)l.movhi r5,hi(FLASH_BASE_ADD)l.srai r5,r5,6l.ori r5,r5,0x0025l.sw 0(r4),r5l.addi r4,r3,MC_TMS(0)l.movhi r5,hi(FLASH_TMS_VAL)l.ori r5,r5,lo(FLASH_TMS_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_BA_MASKl.addi r5,r0,MC_MASK_VALl.sw 0(r4),r5l.addi r4,r3,MC_CSRl.movhi r5,hi(MC_CSR_VAL)l.ori r5,r5,lo(MC_CSR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_TMS(1)l.movhi r5,hi(SDRAM_TMS_VAL)l.ori r5,r5,lo(SDRAM_TMS_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_CSC(1)l.movhi r5,hi(SDRAM_BASE_ADD)l.srai r5,r5,6l.ori r5,r5,0x0411l.sw 0(r4),r5#ifdef FBMEM_BASE_ADDl.addi r4,r3,MC_CSC(2)l.movhi r5,hi(FBMEM_BASE_ADD)l.srai r5,r5,6l.ori r5,r5,0x0005l.sw 0(r4),r5l.addi r4,r3,MC_TMS(2)l.movhi r5,0xffffl.ori r5,r5,0xffffl.sw 0(r4),r5#endifl.jr r9l.nop#elif CONFIG_OR32_MC_VERSION==2ENTRY(_mc_init)l.movhi r3,hi(MC_BASE_ADD)l.ori r3,r3,lo(MC_BASE_ADD)l.addi r4,r3,MC_BAR_0l.movhi r5,hi(FLASH_BAR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_AMR_0l.movhi r5,hi(FLASH_AMR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_WTR_0l.movhi r5,hi(FLASH_WTR_VAL)l.ori r5,r5,lo(FLASH_WTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_RTR_0l.movhi r5,hi(FLASH_RTR_VAL)l.ori r5,r5,lo(FLASH_RTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_OSRl.movhi r5,hi(0x40000000)l.ori r5,r5,lo(0x40000000)l.sw 0(r4),r5l.addi r4,r3,MC_BAR_4l.movhi r5,hi(SDRAM_BAR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_AMR_4l.movhi r5,hi(SDRAM_AMR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_CCR_4l.movhi r5,hi(0x00ef0004)l.ori r5,r5,lo(0x00ef0004)l.sw 0(r4),r5l.addi r4,r3,MC_RATRl.movhi r5,hi(SDRAM_RATR_VAL)l.ori r5,r5,lo(SDRAM_RATR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_RCDRl.movhi r5,hi(SDRAM_RCDR_VAL)l.ori r5,r5,lo(SDRAM_RCDR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_RCTRl.movhi r5,hi(SDRAM_RCTR_VAL)l.ori r5,r5,lo(SDRAM_RCTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_REFCTRl.movhi r5,hi(SDRAM_REFCTR_VAL)l.ori r5,r5,lo(SDRAM_REFCTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_PTRl.movhi r5,hi(SDRAM_PTR_VAL)l.ori r5,r5,lo(SDRAM_PTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_RRDRl.movhi r5,hi(SDRAM_RRDR_VAL)l.ori r5,r5,lo(SDRAM_RRDR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_WRTRl.movhi r5,hi(SDRAM_WRTR_VAL)l.ori r5,r5,lo(SDRAM_WRTR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_RIRl.movhi r5,hi(SDRAM_RIR_VAL)l.ori r5,r5,lo(SDRAM_RIR_VAL)l.sw 0(r4),r5l.addi r4,r3,MC_OSRl.movhi r5,hi(0x5e000000)l.ori r5,r5,lo(0x5e000000)l.sw 0(r4),r5l.addi r4,r3,MC_ORRl.sw 0(r4),r5l.addi r4,r3,MC_OSRl.movhi r5,hi(0x6e000000)l.ori r5,r5,lo(0x6e000000)l.sw 0(r4),r5l.addi r4,r3,MC_ORRl.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.sw 0(r4),r5l.addi r4,r3,MC_OSRl.movhi r5,hi(0x7e000023)l.ori r5,r5,lo(0x7e000023)l.sw 0(r4),r5l.addi r4,r3,MC_ORRl.sw 0(r4),r5l.addi r4,r3,MC_CCR_4l.movhi r5,hi(0xc0ee0004)l.ori r5,r5,lo(0xc0ee0004)l.sw 0(r4),r5l.jr r9l.nop#else# error "no memory controler specified"#endif#ifdef CONFIG_OR32_CACHE_DEBUGENTRY(_ic_enable)SF_DISABLED(r6,INIT_IC_ADDR)l.bf 9fl.nopEMERGENCY_PRINT_STORE_GPR9LOAD_SYMBOL_2_GPR(r4,_string_icache_clean)tophys (r3,r4)l.jal _emergency_printl.nop/* Disable IC */l.mfspr r6,r0,SPR_SRl.addi r5,r0,-1l.xori r5,r5,SPR_SR_ICEl.and r5,r6,r5l.mtspr r0,r5,SPR_SR/* Invalidate IC */l.addi r6,r0,0l.addi r5,r0,IC_SIZE1:#if 0LOAD_SYMBOL_2_GPR(r4,_string_ic_invalidate)tophys (r3,r4)l.jal _emergency_printl.nopl.jal _emergency_print_nrl.addi r3,r6,0#endifl.mtspr r0,r6,SPR_ICBIRl.sfne r6,r5l.bf 1bl.addi r6,r6,IC_LINELOAD_SYMBOL_2_GPR(r4,_string_ic_enable)tophys (r3,r4)l.jal _emergency_printl.nop/* Enable IC */l.mfspr r6,r0,SPR_SRl.ori r6,r6,SPR_SR_ICEl.mtspr r0,r6,SPR_SRl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopEMERGENCY_PRINT_LOAD_GPR99:l.jr r9l.nop#elseENTRY(_ic_enable)SF_DISABLED(r6,INIT_IC_ADDR)l.bf 9fl.nop/* Disable IC */l.mfspr r6,r0,SPR_SRl.addi r5,r0,-1l.xori r5,r5,SPR_SR_ICEl.and r5,r6,r5l.mtspr r0,r5,SPR_SR/* Invalidate IC */l.addi r6,r0,0l.addi r5,r0,IC_SIZE1:l.mtspr r0,r6,SPR_ICBIRl.sfne r6,r5l.bf 1bl.addi r6,r6,IC_LINE/* Enable IC */l.mfspr r6,r0,SPR_SRl.ori r6,r6,SPR_SR_ICEl.mtspr r0,r6,SPR_SRl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nopl.nop9:l.jr r9l.nop#endif#ifdef CONFIG_OR32_CACHE_DEBUGENTRY(_dc_enable)SF_DISABLED(r6,INIT_DC_ADDR)l.bf 9fl.nopEMERGENCY_PRINT_STORE_GPR9LOAD_SYMBOL_2_GPR(r4,_string_dcache_clean)tophys (r3,r4)l.jal _emergency_printl.nop/* Disable DC */l.mfspr r6,r0,SPR_SRl.addi r5,r0,-1l.xori r5,r5,SPR_SR_DCEl.and r5,r6,r5l.mtspr r0,r5,SPR_SR/* Flush DC */l.addi r6,r0,0l.addi r5,r0,DC_SIZE1:#ifdef CONFIG_OR32_CACHE_DEBUGLOAD_SYMBOL_2_GPR(r4,_string_dc_invalidate)tophys (r3,r4)l.jal _emergency_printl.nopl.jal _emergency_print_nrl.addi r3,r6,0#endifl.mtspr r0,r6,SPR_DCBIRl.sfne r6,r5l.bf 1bl.addi r6,r6,DC_LINELOAD_SYMBOL_2_GPR(r4,_string_dc_enable)tophys (r3,r4)l.jal _emergency_printl.nop/* Enable DC */l.mfspr r6,r0,SPR_SRl.ori r6,r6,SPR_SR_DCEl.mtspr r0,r6,SPR_SREMERGENCY_PRINT_LOAD_GPR99:l.jr r9l.nop#elseENTRY(_dc_enable)SF_DISABLED(r6,INIT_DC_ADDR)l.bf 9fl.nop/* Disable DC */l.mfspr r6,r0,SPR_SRl.addi r5,r0,-1l.xori r5,r5,SPR_SR_DCEl.and r5,r6,r5l.mtspr r0,r5,SPR_SR/* Flush DC */l.addi r6,r0,0l.addi r5,r0,DC_SIZE1:l.mtspr r0,r6,SPR_DCBIRl.sfne r6,r5l.bf 1bl.addi r6,r6,DC_LINE/* Enable DC */l.mfspr r6,r0,SPR_SRl.ori r6,r6,SPR_SR_DCEl.mtspr r0,r6,SPR_SR9:l.jr r9l.nop#endif/* ===============================================[ page table masks ]=== */#define DTLB_UP_CONVERT_MASK 0x3fe#define ITLB_UP_CONVERT_MASK 0x3e/* for SMP we'd have (this is a bit subtle, CC must be always set* for SMP, but since we have _PAGE_PRESENT bit always defined* we can just modify the mask)*/#define DTLB_SMP_CONVERT_MASK 0x3ff#define ITLB_SMP_CONVERT_MASK 0x3f/* ==============================================[ DTLB miss handler ]=== */.global _dtlb_miss_handler_dtlb_miss_handler:EXCEPTION_DEBUG_VALUE_ER(0x900)EXCEPTION_STORE_GPR2EXCEPTION_STORE_GPR3EXCEPTION_STORE_GPR4EXCEPTION_STORE_GPR5/** get EA of the miss*/l.mfspr r2,r0,SPR_EEAR_BASE/** pmd = (pmd_t *)(current_pgd + pgd_index(daddr));*/GET_CURRENT_PGD(r3,r5) // r3 is current_pgd, r5 is templ.srli r4,r2,0x18 // >> PAGE_SHIFT + (PAGE_SHIFT - 2)l.slli r4,r4,0x2 // to get address << 2l.add r5,r4,r3 // r4 is pgd_index(daddr)/** if (pmd_none(*pmd))* goto pmd_none:*/tophys (r4,r5)l.lwz r3,0x0(r4) // get *pmd valuel.sfne r3,r0l.bnf d_pmd_nonel.andi r3,r3,0x1fff // ~PAGE_MASK/** if (pmd_bad(*pmd))* pmd_clear(pmd)* goto pmd_bad:*/// l.sfeq r3,r0 // check *pmd value// l.bf d_pmd_goodl.addi r3,r0,0xffffe000 // PAGE_MASK// l.j d_pmd_bad// l.sw 0x0(r4),r0 // clear pmdd_pmd_good:/** pte = *pte_offset(pmd, daddr);*/l.lwz r4,0x0(r4) // get **pmd valuel.and r4,r4,r3 // & PAGE_MASKl.srli r5,r2,0xd // >> PAGE_SHIFT, r2 == EEARl.andi r3,r5,0x7ff // (1UL << PAGE_SHIFT - 2) - 1l.slli r3,r3,0x2 // to get address << 2l.add r3,r3,r4l.lwz r2,0x0(r3) // this is pte at last/** if (!pte_present(pte))*/l.andi r4,r2,0x1l.sfne r4,r0 // is pte presentl.bnf d_pte_not_presentl.addi r3,r0,0xffffe3fe // PAGE_MASK | DTLB_UP_CONVERT_MASK/** fill DTLB TR register*/l.and r4,r2,r3 // apply the maskl.andi r5,r5,0x3f // calc offset: & (NUM_TLB_ENTRIES-1), NUM_TLB_ENTRIES == 64l.mtspr r5,r4,SPR_DTLBTR_BASE(0)/** fill DTLB MR register*/l.mfspr r2,r0,SPR_EEAR_BASEl.addi r3,r0,0xffffe000 // PAGE_MASKl.and r4,r2,r3 // apply PAGE_MASK to EA (__PHX__ do we really need this?)l.ori r4,r4,0x1 // set hardware valid bit: DTBL_MR entryl.mtspr r5,r4,SPR_DTLBMR_BASE(0)#ifndef CONFIG_DMMU_WORKSl.addi r5,r5,1l.andi r5,r5,0x3fl.mtspr r5,r0,SPR_DTLBMR_BASE(0)l.addi r5,r5,-2l.andi r5,r5,0x3fl.mtspr r5,r0,SPR_DTLBMR_BASE(0)#endifEXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5l.rfed_pmd_bad:l.nop 1EXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5l.rfed_pmd_none:d_pte_not_present:EXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5// __PHX__ for debugging purposesDEBUG_TLB_PROBE(0x903)l.j _dispatch_do_dpage_faultl.nop/* ==============================================[ ITLB miss handler ]=== */.global _itlb_miss_handler_itlb_miss_handler:EXCEPTION_DEBUG_VALUE_ER(0xa00)EXCEPTION_STORE_GPR2EXCEPTION_STORE_GPR3EXCEPTION_STORE_GPR4EXCEPTION_STORE_GPR5/** get EA of the miss*/l.mfspr r2,r0,SPR_EEAR_BASE#ifndef CONFIG_IMMU_WORKS// check for exception in delay slot and on page boundryl.andi r3,r2,0x1fff // PAGE_SIZE - 1l.sfeqi r3,0l.bnf 1fl.nop // we are on page boundryl.mfspr r4,r0,SPR_EPCR_BASEl.sfeq r4,r2l.bf 1f // EPC and EEA are equal -> not in delay slotl.nopl.mfspr r5,r0,SPR_ESR_BASE // are we in user model.andi r5,r5,SPR_SR_SMl.sfeqi r5,0l.bnf 2f // kernel model.nop// user mode: no fixupEXCEPTION_STORE_GPR9l.jal _emergency_printl.ori r3,r0,lo(_string_pbjds) // page boundry, jump, delay slotl.nop 0x1l.j 1fEXCEPTION_LOAD_GPR92:EXCEPTION_STORE_GPR6EXCEPTION_STORE_GPR9// ok, we are in trouble...l.jal _immu_trampoline_workaroundl.nopEXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5EXCEPTION_LOAD_GPR6EXCEPTION_LOAD_GPR9l.rfe1: // this is not delay slot exception of the page boundry#endif/** pmd = (pmd_t *)(current_pgd + pgd_index(daddr));**/GET_CURRENT_PGD(r3,r5) // r3 is current_pgd, r5 is templ.srli r4,r2,0x18 // >> PAGE_SHIFT + (PAGE_SHIFT - 2)l.slli r4,r4,0x2 // to get address << 2l.add r5,r4,r3 // r4 is pgd_index(daddr)/** if (pmd_none(*pmd))* goto pmd_none:*/tophys (r4,r5)l.lwz r3,0x0(r4) // get *pmd valuel.sfne r3,r0l.bnf i_pmd_nonel.andi r3,r3,0x1fff // ~PAGE_MASK/** if (pmd_bad(*pmd))* pmd_clear(pmd)* goto pmd_bad:*/// l.sfeq r3,r0 // check *pmd value// l.bf i_pmd_goodl.addi r3,r0,0xffffe000 // PAGE_MASK// l.j i_pmd_bad// l.sw 0x0(r4),r0 // clear pmdi_pmd_good:/** pte = *pte_offset(pmd, iaddr);**/l.lwz r4,0x0(r4) // get **pmd valuel.and r4,r4,r3 // & PAGE_MASKl.srli r5,r2,0xd // >> PAGE_SHIFT, r2 == EEARl.andi r3,r5,0x7ff // (1UL << PAGE_SHIFT - 2) - 1l.slli r3,r3,0x2 // to get address << 2l.add r3,r3,r4l.lwz r2,0x0(r3) // this is pte at last/** if (!pte_present(pte))**/l.andi r4,r2,0x1l.sfne r4,r0 // is pte presentl.bnf i_pte_not_presentl.addi r3,r0,0xffffe03e // PAGE_MASK | ITLB_UP_CONVERT_MASK/** fill DTLB TR register*/l.and r4,r2,r3 // apply the maskl.andi r3,r2,0x7c0 // _PAGE_EXEC | _PAGE_SRE | _PAGE_SWE | _PAGE_URE | _PAGE_UWE// l.andi r3,r2,0x400 // _PAGE_EXECl.sfeq r3,r0l.bf itlb_tr_fill //_workaroundl.andi r5,r5,0x3f // calc offset: & (NUM_TLB_ENTRIES-1), NUM_TLB_ENTRIES == 64/** __PHX__ :: fixme* we should not just blindly set executable flags,* but it does help with ping. the clean way would be to find out* (and fix it) why stack doesn't have execution permissions*/itlb_tr_fill_workaround:l.ori r4,r4,0xc0 // | (SPR_ITLBTR_UXE | ITLBTR_SXE)itlb_tr_fill:l.mtspr r5,r4,SPR_ITLBTR_BASE(0)/** fill DTLB MR register*/l.mfspr r2,r0,SPR_EEAR_BASEl.addi r3,r0,0xffffe000 // PAGE_MASKl.and r4,r2,r3 // apply PAGE_MASK to EA (__PHX__ do we really need this?)l.ori r4,r4,0x1 // set hardware valid bit: DTBL_MR entryl.mtspr r5,r4,SPR_ITLBMR_BASE(0)#ifndef CONFIG_IMMU_WORKSl.addi r5,r5,1l.andi r5,r5,0x3fl.mtspr r5,r0,SPR_ITLBMR_BASE(0)l.addi r5,r5,-2l.andi r5,r5,0x3fl.mtspr r5,r0,SPR_ITLBMR_BASE(0)#endifEXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5l.rfei_pmd_bad:l.nop 1EXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5l.rfei_pmd_none:i_pte_not_present:EXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5// __PHX__ for debugging purposesDEBUG_TLB_PROBE(0xa04)l.j _dispatch_do_ipage_faultl.nop/* ==============================================[ boot tlb handlers ]=== *//* ---[ boot dtlb miss handler ]----------------------------------------- */boot_dtlb_miss_handler:/* mask for DTLB_MR register: - (0) sets V (valid) bit,* - (31-12) sets bits belonging to VPN (31-12)*/#define DTLB_MR_MASK 0xfffff001/* mask for DTLB_TR register: - (2) sets CI (cache inhibit) bit,* - (4) sets A (access) bit,* - (5) sets D (dirty) bit,* - (8) sets SRE (superuser read) bit* - (9) sets SWE (superuser write) bit* - (31-12) sets bits belonging to VPN (31-12)*/#define DTLB_TR_MASK 0xfffff332#define VPN_MASK 0xfffff000#define PPN_MASK 0xfffff000/** a % 64 = a & MOD_64_MASK*/#define MOD_64_MASK 0x3f#define MOD_64(dest,src) \l.andi dest,src,MOD_64_MASKEXCEPTION_DEBUG_VALUE_ER(0x9b0)EXCEPTION_STORE_GPR6l.mfspr r6,r0,SPR_ESR_BASE //l.andi r6,r6,SPR_SR_SM // are we in kernel mode ?l.sfeqi r6,0 // r6 == 0x1 --> SMl.bf exit_with_no_dtranslation //l.nop/* this could be optimized by moving storing of* non r6 registers here, and jumping r6 restore* if not in supervisor mode*/EXCEPTION_STORE_GPR2EXCEPTION_STORE_GPR3EXCEPTION_STORE_GPR4EXCEPTION_STORE_GPR5l.mfspr r4,r0,SPR_EEAR_BASE // get the offending EA/* do not do any translation if EA is above DRAM_END */LOAD_SYMBOL_2_GPR(r6,DRAM_END)l.sfgtu r4,r6 // flag if EA larger than DRAM_ENDl.bf exit_with_no_dtranslation/* delay slot */immediate_translation:CLEAR_GPR(r6)l.srli r3,r4,0xd // r3 <- r4 / 8192 (sets are relative to page size (8Kb) NOT VPN size (4Kb)l.andi r2,r3,MOD_64_MASK // r2 <- r3 % 64: ok this is SETl.or r6,r6,r4 // r6 <- r4l.ori r6,r6,~(VPN_MASK) // r6 <- VPN :VPN .xfff - clear up lo(r6) to 0x**** *fffl.movhi r5,hi(DTLB_MR_MASK) // r5 <- ffff:0000.x000l.ori r5,r5,lo(DTLB_MR_MASK) // r5 <- ffff:1111.x001 - apply DTLB_MR_MASKl.and r5,r5,r6 // r5 <- VPN :VPN .x001 - we have DTLBMR entryl.mtspr r2,r5,SPR_DTLBMR_BASE(0) // set DTLBMR/* set up DTLB with no translation for EA <= 0xbfffffff */LOAD_SYMBOL_2_GPR(r6,0xbfffffff)l.sfgeu r6,r4 // flag if r6 >= r4 (if 0xbfffffff >= EA)l.bf 1f // goto outl.and r3,r4,r4 // delay slot :: 24 <- r4 (if flag==1)tophys(r3,r4) // r3 <- PA1:l.ori r3,r3,~(PPN_MASK) // r3 <- PPN :PPN .xfff - clear up lo(r6) to 0x**** *fffl.movhi r5,hi(DTLB_TR_MASK) // r5 <- ffff:0000.x000l.ori r5,r5,lo(DTLB_TR_MASK) // r5 <- ffff:1111.x330 - apply DTLB_MR_MASKl.and r5,r5,r3 // r5 <- PPN :PPN .x330 - we have DTLBTR entryl.mtspr r2,r5,SPR_DTLBTR_BASE(0) // set DTLBTR#ifndef CONFIG_DMMU_WORKSl.addi r2,r2,1l.andi r2,r2,0x3fl.mtspr r2,r0,SPR_DTLBMR_BASE(0)l.addi r2,r2,-2l.andi r2,r2,0x3fl.mtspr r2,r0,SPR_DTLBMR_BASE(0)#endifEXCEPTION_LOAD_GPR6EXCEPTION_LOAD_GPR5EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR2l.rfe // SR <- ESR, PC <- EPCexit_with_no_dtranslation:/* EA out of memory or not in supervisor mode */EXCEPTION_LOAD_GPR6EXCEPTION_LOAD_GPR4l.j _dispatch_bus_fault/* ---[ boot itlb miss handler ]----------------------------------------- */boot_itlb_miss_handler:/* mask for ITLB_MR register: - sets V (valid) bit,* - sets bits belonging to VPN (15-12)*/#define ITLB_MR_MASK 0xfffff001/* mask for ITLB_TR register: - sets A (access) bit,* - sets SXE (superuser execute) bit* - sets bits belonging to VPN (15-12)*/#define ITLB_TR_MASK 0xfffff050#define VPN_MASK 0xfffff000#define PPN_MASK 0xfffff000/** a % 64 = a & MOD_64_MASK*/#define MOD_64_MASK 0x3f#define MOD_64(dest,src) \l.andi dest,src,MOD_64_MASKEXCEPTION_DEBUG_VALUE_ER(0xab0)EXCEPTION_STORE_GPR2EXCEPTION_STORE_GPR3EXCEPTION_STORE_GPR4EXCEPTION_STORE_GPR5EXCEPTION_STORE_GPR6l.mfspr r6,r0,SPR_ESR_BASE //l.andi r6,r6,SPR_SR_SM // are we in kernel mode ?l.sfeqi r6,0 // r6 == 0x1 --> SMl.bf exit_with_no_itranslationl.nop#ifndef CONFIG_IMMU_WORKSl.mfspr r2,r0,SPR_EEAR_BASE// check for exception in delay slot and on page boundryl.andi r3,r2,0x1fff // PAGE_SIZE - 1l.sfeqi r3,0l.bnf 1fl.nop // we are on page boundryl.mfspr r4,r0,SPR_EPCR_BASEl.sfeq r4,r2l.bf 1f // EPC and EEA are equal -> not in delay slotl.nopEXCEPTION_STORE_GPR6EXCEPTION_STORE_GPR9// ok, we are in trouble...l.jal _immu_trampoline_workaroundl.nopEXCEPTION_LOAD_GPR2EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR5EXCEPTION_LOAD_GPR6EXCEPTION_LOAD_GPR9l.rfe1: // this is not delay slot exception of the page boundry#endifl.mfspr r4,r0,SPR_EEAR_BASE // get the offending EA/* do not do any translation if EA is above DRAM_END */LOAD_SYMBOL_2_GPR(r6,DRAM_END)l.sfgtu r4,r6 // flag if EA larger than DRAM_ENDl.bf exit_with_no_itranslationl.nopCLEAR_GPR(r6)l.srli r3,r4,0xd // r3 <- r4 / 8192 (sets are relative to page size (8Kb) NOT VPN size (4Kb)l.andi r2,r3,MOD_64_MASK // r2 <- r3 % 64: ok this is SETl.or r6,r6,r4 // r6 <- r4l.ori r6,r6,~(VPN_MASK) // r6 <- VPN :VPN .xfff - clear up lo(r6) to 0x**** *fffl.movhi r5,hi(ITLB_MR_MASK) // r5 <- ffff:0000.x000l.ori r5,r5,lo(ITLB_MR_MASK) // r5 <- ffff:1111.x001 - apply ITLB_MR_MASKl.and r5,r5,r6 // r5 <- VPN :VPN .x001 - we have ITLBMR entryl.mtspr r2,r5,SPR_ITLBMR_BASE(0) // set ITLBMR/** set up ITLB with no translation for EA <= 0x0fffffff** we need this for head.S mapping (EA = PA). if we move all functions* which run with mmu enabled into entry.S, we might be able to eliminate this.**/LOAD_SYMBOL_2_GPR(r6,0x0fffffff)l.sfgeu r6,r4 // flag if r6 >= r4 (if 0xb0ffffff >= EA)l.bf 1f // goto outl.and r3,r4,r4 // delay slot :: 24 <- r4 (if flag==1)tophys(r3,r4) // r3 <- PA1:l.ori r3,r3,~(PPN_MASK) // r3 <- PPN :PPN .xfff - clear up lo(r6) to 0x**** *fffl.movhi r5,hi(ITLB_TR_MASK) // r5 <- ffff:0000.x000l.ori r5,r5,lo(ITLB_TR_MASK) // r5 <- ffff:1111.x050 - apply ITLB_MR_MASKl.and r5,r5,r3 // r5 <- PPN :PPN .x050 - we have ITLBTR entryl.mtspr r2,r5,SPR_ITLBTR_BASE(0) // set ITLBTR#ifndef CONFIG_IMMU_WORKSl.addi r2,r2,1l.andi r2,r2,0x3fl.mtspr r2,r0,SPR_ITLBMR_BASE(0)l.addi r2,r2,-2l.andi r2,r2,0x3fl.mtspr r2,r0,SPR_ITLBMR_BASE(0)#endifEXCEPTION_LOAD_GPR6EXCEPTION_LOAD_GPR5EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR3EXCEPTION_LOAD_GPR2l.rfe // SR <- ESR, PC <- EPCexit_with_no_itranslation:EXCEPTION_LOAD_GPR4EXCEPTION_LOAD_GPR6l.j _dispatch_bus_faultl.nop/* =================================================[ debugging aids ]=== */.align 64_immu_trampoline:.space 64_immu_trampoline_top:#define TRAMP_SLOT_0 (0x0)#define TRAMP_SLOT_1 (0x4)#define TRAMP_SLOT_2 (0x8)#define TRAMP_SLOT_3 (0xc)#define TRAMP_SLOT_4 (0x10)#define TRAMP_SLOT_5 (0x14)#define TRAMP_FRAME_SIZE (0x18)ENTRY(_immu_trampoline_workaround)// r2 EEA// r6 is physical EEAtophys(r6,r2)LOAD_SYMBOL_2_GPR(r5,_immu_trampoline)tophys (r3,r5) // r3 is trampoline (physical)LOAD_SYMBOL_2_GPR(r4,0x15000000)l.sw (TRAMP_SLOT_0)r3,r4l.sw (TRAMP_SLOT_1)r3,r4l.sw (TRAMP_SLOT_4)r3,r4l.sw (TRAMP_SLOT_5)r3,r4// EPC = EEA - 0x4l.lwz r4,(0x0)r6 // load op @ EEA + 0x0 (fc address)l.sw (TRAMP_SLOT_3)r3,r4 // store it to _immu_trampoline_datal.lwz r4,(-0x4)r6 // load op @ EEA - 0x4 (f8 address)l.sw (TRAMP_SLOT_2)r3,r4 // store it to _immu_trampoline_datal.srli r5,r4,26 // check opcode for write accessl.sfeqi r5,0 // l.jl.bf 0fl.sfeqi r5,0x11 // l.jrl.bf 1fl.sfeqi r5,1 // l.jall.bf 2fl.sfeqi r5,0x12 // l.jalrl.bf 3fl.sfeqi r5,3 // l.bnfl.bf 4fl.sfeqi r5,4 // l.bfl.bf 5f99:l.nopl.j 99b // should never happenl.nop 1// r2 is EEA// r3 is trampoline address (physical)// r4 is instruction// r6 is physical(EEA)//// r52: // l.jal/* 19 20 aa aa l.movhi r9,0xaaaa* a9 29 bb bb l.ori r9,0xbbbb** where 0xaaaabbbb is EEA + 0x4 shifted right 2*/l.addi r6,r2,0x4 // this is 0xaaaabbbb// l.movhi r9,0xaaaal.ori r5,r0,0x1920 // 0x1920 == l.movhi r9l.sh (TRAMP_SLOT_0+0x0)r3,r5l.srli r5,r6,16l.sh (TRAMP_SLOT_0+0x2)r3,r5// l.ori r9,0xbbbbl.ori r5,r0,0xa929 // 0xa929 == l.ori r9l.sh (TRAMP_SLOT_1+0x0)r3,r5l.andi r5,r6,0xffffl.sh (TRAMP_SLOT_1+0x2)r3,r5/* falthrough, need to set up new jump offset */0: // l.jl.slli r6,r4,6 // original offset shifted left 6 - 2// l.srli r6,r6,6 // original offset shifted right 2l.slli r4,r2,4 // old jump position: EEA shifted left 4// l.srli r4,r4,6 // old jump position: shifted right 2l.addi r5,r3,0xc // new jump position (physical)l.slli r5,r5,4 // new jump position: shifted left 4// calculate new jump offset// new_off = old_off + (old_jump - new_jump)l.sub r5,r4,r5 // old_jump - new_jumpl.add r5,r6,r5 // orig_off + (old_jump - new_jump)l.srli r5,r5,6 // new offset shifted right 2// r5 is new jump offset// l.j has opcode 0x0...l.sw (TRAMP_SLOT_2)r3,r5 // write it backl.j trampoline_outl.nop/* ----------------------------- */3: // l.jalr/* 19 20 aa aa l.movhi r9,0xaaaa* a9 29 bb bb l.ori r9,0xbbbb** where 0xaaaabbbb is EEA + 0x4 shifted right 2*/l.addi r6,r2,0x4 // this is 0xaaaabbbb// l.movhi r9,0xaaaal.ori r5,r0,0x1920 // 0x1920 == l.movhi r9l.sh (TRAMP_SLOT_0+0x0)r3,r5l.srli r5,r6,16l.sh (TRAMP_SLOT_0+0x2)r3,r5// l.ori r9,0xbbbbl.ori r5,r0,0xa929 // 0xa929 == l.ori r9l.sh (TRAMP_SLOT_1+0x0)r3,r5l.andi r5,r6,0xffffl.sh (TRAMP_SLOT_1+0x2)r3,r5l.lhz r5,(TRAMP_SLOT_2+0x0)r3 // load hi part of jump instructionl.andi r5,r5,0x3ff // clear out opcode partl.ori r5,r5,0x4400 // opcode changed from l.jalr -> l.jrl.sh (TRAMP_SLOT_2+0x0)r3,r5 // write it back/* falthrough */1: // l.jrl.j trampoline_outl.nop/* ----------------------------- */4: // l.bnf5: // l.bfl.slli r6,r4,6 // original offset shifted left 6 - 2// l.srli r6,r6,6 // original offset shifted right 2l.slli r4,r2,4 // old jump position: EEA shifted left 4// l.srli r4,r4,6 // old jump position: shifted right 2l.addi r5,r3,0xc // new jump position (physical)l.slli r5,r5,4 // new jump position: shifted left 4// calculate new jump offset// new_off = old_off + (old_jump - new_jump)l.add r6,r6,r4 // (orig_off + old_jump)l.sub r6,r6,r5 // (orig_off + old_jump) - new_jumpl.srli r6,r6,6 // new offset shifted right 2// r6 is new jump offsetl.lwz r4,(TRAMP_SLOT_2+0x0)r3 // load jump instructionl.srli r4,r4,16l.andi r4,r4,0xfc00 // get opcode partl.slli r4,r4,16l.or r6,r4,r6 // l.b(n)f new offsetl.sw (TRAMP_SLOT_2)r3,r6 // write it back/* we need to add l.j to EEA + 0x8 */tophys (r4,r2) // may not be needed (due to shifts down_l.addi r4,r4,(0x8 - 0x8) // jump target = r2 + 0x8 (compensate for 0x8)// jump position = r5 + 0x8 (0x8 compensated)l.sub r4,r4,r5 // jump offset = target - new_position + 0x8l.slli r4,r4,4 // the amount of info in imediate of jumpl.srli r4,r4,6 // jump instruction with offsetl.sw (TRAMP_SLOT_4)r3,r4 // write it to 4th slot/* fallthrough */trampoline_out:// set up new EPC to point to our trampoline codeLOAD_SYMBOL_2_GPR(r5,_immu_trampoline)l.mtspr r0,r5,SPR_EPCR_BASE// immu_trampoline is (4x) CACHE_LINE aligned// and only 6 instructions long,// so we need to invalidate only 2 linesl.mtspr r0,r5,SPR_ICBIRl.addi r5,r5,IC_LINEl.mtspr r0,r5,SPR_ICBIRl.jr r9l.nop/** dumping processor state without mmu* (not yet finnished)*/ENTRY(_debug_tng)l.addi r1,r1,-16l.sw 0(r1),r3l.sw 4(r1),r4l.mfspr r3,r0,SPR_SRl.sw 8(r1),r3l.mfspr r3,r0,SPR_PCl.sw 12(r1),r3l.ori r3,r0,0x8001l.mtspr r0,r3,SPR_ESR_BASELOAD_SYMBOL_2_GPR(r3,nommu_entry)tophys (r4,r3)l.mtspr r0,r4,SPR_EPCR_BASEl.lwz r3,0(r1)l.lwz r4,4(r1)l.addi r1,r1,8l.rfenommu_entry:EXCEPTION_T_STORE_GPR31EXCEPTION_T_STORE_GPR2EXCEPTION_T_STORE_SP/* temporary store r3, r9 into r1, r2 */l.addi r1,r3,0x0l.addi r2,r9,0x0/* the string referenced by r3 must be low enough */l.jal _emergency_printl.ori r3,r0,lo(_string_ed)l.mfspr r3,r0,SPR_PCl.jal _emergency_print_nrl.andi r3,r3,0x1f00/* the string referenced by r3 must be low enough */l.jal _emergency_printl.ori r3,r0,lo(_string_epc_prefix)l.jal _emergency_print_nrl.mfspr r3,r0,SPR_EPCR_BASEl.jal _emergency_printl.ori r3,r0,lo(_string_nl)/* end of printing */l.addi r3,r1,0x0l.addi r9,r2,0x0/* extract current, ksp from current_set */LOAD_SYMBOL_2_GPR(r1,_unhandled_stack_top)/* create new stack frame, save only needed gprs *//* r1: KSP, r2: current, r31: __pa(KSP) *//* r12: temp, syscall indicator, r13 temp */l.addi r1,r1,-(INT_FRAME_SIZE)/* r1 is KSP, r31 is __pa(KSP) */tophys (r31,r1)l.sw GPR12(r31),r12l.mfspr r12,r0,SPR_EPCR_BASEl.sw PC(r31),r12l.mfspr r12,r0,SPR_ESR_BASEl.sw SR(r31),r12/* save r31 */EXCEPTION_T_LOAD_GPR31(r12)l.sw GPR31(r31),r12/* save r2 as was prior to exception */EXCEPTION_T_LOAD_GPR2(r12)l.sw GPR2(r31),r12/* save SP as was prior to exception */EXCEPTION_T_LOAD_SP(r12)l.sw SP(r31),r12l.sw GPR13(r31),r13/* --> *//* save exception r4, set r4 = EA */l.sw GPR4(r31),r4l.mfspr r4,r0,SPR_EEAR_BASE/* r31 is __pa(r1), r1 <- r31 */l.addi r1,r31,0x0/* r1, r2, EPCR, ESR a already saved */l.sw GPR3(r1),r3l.sw ORIG_GPR3(r1),r3l.sw GPR5(r1),r5l.sw GPR6(r1),r6l.sw GPR7(r1),r7l.sw GPR8(r1),r8l.sw GPR9(r1),r9l.sw GPR10(r1),r10l.sw GPR11(r1),r11/* r12,r13 already saved */l.sw GPR14(r1),r14l.sw GPR15(r1),r15l.sw GPR16(r1),r16l.sw GPR17(r1),r17l.sw GPR18(r1),r18l.sw GPR19(r1),r19l.sw GPR20(r1),r20l.sw GPR21(r1),r21l.sw GPR22(r1),r22l.sw GPR23(r1),r23l.sw GPR24(r1),r24l.sw GPR25(r1),r25l.sw GPR26(r1),r26l.sw GPR27(r1),r27l.sw GPR28(r1),r28l.sw GPR29(r1),r29l.sw GPR30(r1),r30/* r31 already saved */l.sw RESULT(r1),r0l.addi r3,r1,0/* r4 is exception EA */l.addi r5,r0,0xdeadl.jal _nommu_dump_statel.nop/* ========================================[ standard debugging aids ]=== */// this HAS to be atomic. also disable interrupts beetwen to entries// may use gpr4ENTRY(_exception_regenerate)E_REGEN_LOAD_STATUS(r4) // were we in this exception yetl.sfeqi r4,0x0l.bnf 1fl.nop0: // first entry into this exception// patch the ESR, reenter exceptionl.mfspr r4,r0,SPR_ESR_BASE // get original ESRE_REGEN_STORE_STATUS(r4) // save original ESRSPR_DISABLE_LO_BITS(SPR_ESR_BASE,(SPR_SR_ICE | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE),r4)SPR_DISABLE_LO_BITS(SPR_SR,(SPR_SR_ICE | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE),r4)EXCEPTION_DEBUG_LOAD_GPR4EXCEPTION_DEBUG_LOAD_F_GPR9l.rfe // this will regenerate exception1: // second entry into this exception// patch ESR, invalidate the caches// we already loaded previous ESR into r4l.mtspr r0,r4,SPR_ESR_BASEl.ori r4,r0,0x0 // next time is fresh entryE_REGEN_STORE_STATUS(r4) // prepare for next exceptionE_REGEN_STORE_GPR3E_REGEN_STORE_GPR4E_REGEN_STORE_GPR5E_REGEN_STORE_GPR6E_REGEN_STORE_GPR9l.jal _dc_enablel.nopl.jal _ic_enablel.nopE_REGEN_LOAD_GPR3E_REGEN_LOAD_GPR4E_REGEN_LOAD_GPR5E_REGEN_LOAD_GPR6E_REGEN_LOAD_GPR9l.jr r9l.nopENTRY(_exception_debug)EXCEPTION_DEBUG_STORE_GPR3EXCEPTION_DEBUG_STORE_GPR9// disable tick timerl.mfspr r3,r0,SPR_TTMRLOAD_SYMBOL_2_GPR(r9,~(0x30000003))l.and r3,r3,r9l.mtspr r0,r3,SPR_TTMRl.jal _emergency_printl.ori r3,r0,lo(_string_debug_exception)l.jal _emergency_print_nrl.andi r3,r4,0x1ff0/* the string referenced by r3 must be low enough */l.jal _emergency_printl.ori r3,r0,lo(_string_epc_prefix)l.jal _emergency_print_nrl.mfspr r3,r0,SPR_EPCR_BASEl.jal _emergency_printl.ori r3,r0,lo(_string_debug_esr_prefix)l.jal _emergency_print_nrl.mfspr r3,r0,SPR_ESR_BASEl.jal _emergency_printl.ori r3,r0,lo(_string_debug_eear_prefix)l.jal _emergency_print_nrl.mfspr r3,r0,SPR_EEAR_BASEl.jal _emergency_printl.ori r3,r0,lo(_string_nl)// enable tick timerl.mfspr r3,r0,SPR_TTMRLOAD_SYMBOL_2_GPR(r9,0x20000001)l.or r3,r3,r9l.mtspr r0,r3,SPR_TTMREXCEPTION_DEBUG_LOAD_GPR3EXCEPTION_DEBUG_LOAD_GPR9l.jr r9l.nop/** DSCR: prints a string referenced by r3.** PRMS: r3 - address of the first character of null* terminated string to be printed** PREQ: UART at UART_BASE_ADD has to be initialized** POST: caller should be aware that r3, r9 are changed*/ENTRY(_emergency_print)EMERGENCY_PRINT_STORE_GPR4EMERGENCY_PRINT_STORE_GPR5EMERGENCY_PRINT_STORE_GPR6EMERGENCY_PRINT_STORE_GPR72:l.lbz r7,0(r3)l.sfeq r7,r0l.bf 9fl.nop// putc:l.movhi r4,hi(UART_BASE_ADD)l.addi r6,r0,0x201: l.lbz r5,5(r4)l.andi r5,r5,0x20l.sfeq r5,r6l.bnf 1bl.nopl.sb 0(r4),r7l.addi r6,r0,0x601: l.lbz r5,5(r4)l.andi r5,r5,0x60l.sfeq r5,r6l.bnf 1bl.nop/* next character */l.j 2bl.addi r3,r3,0x19:EMERGENCY_PRINT_LOAD_GPR7EMERGENCY_PRINT_LOAD_GPR6EMERGENCY_PRINT_LOAD_GPR5EMERGENCY_PRINT_LOAD_GPR4l.jr r9l.nopENTRY(_emergency_print_nr)EMERGENCY_PRINT_STORE_GPR4EMERGENCY_PRINT_STORE_GPR5EMERGENCY_PRINT_STORE_GPR6EMERGENCY_PRINT_STORE_GPR7EMERGENCY_PRINT_STORE_GPR8l.addi r8,r0,32 // shift register1: /* remove leading zeros */l.addi r8,r8,-0x4l.srl r7,r3,r8l.andi r7,r7,0xf/* don't skip the last zero if number == 0x0 */l.sfeqi r8,0x4l.bf 2fl.nopl.sfeq r7,r0l.bf 1bl.nop2:l.srl r7,r3,r8l.andi r7,r7,0xfl.sflts r8,r0l.bf 9fl.sfgtui r7,0x9l.bnf 8fl.nopl.addi r7,r7,0x278:l.addi r7,r7,0x30// putc:l.movhi r4,hi(UART_BASE_ADD)l.addi r6,r0,0x201: l.lbz r5,5(r4)l.andi r5,r5,0x20l.sfeq r5,r6l.bnf 1bl.nopl.sb 0(r4),r7l.addi r6,r0,0x601: l.lbz r5,5(r4)l.andi r5,r5,0x60l.sfeq r5,r6l.bnf 1bl.nop/* next character */l.j 2bl.addi r8,r8,-0x49:EMERGENCY_PRINT_LOAD_GPR8EMERGENCY_PRINT_LOAD_GPR7EMERGENCY_PRINT_LOAD_GPR6EMERGENCY_PRINT_LOAD_GPR5EMERGENCY_PRINT_LOAD_GPR4l.jr r9l.nopENTRY(_early_uart_init)l.movhi r3,hi(UART_BASE_ADD)l.addi r4,r0,0x7l.sb 0x2(r3),r4l.addi r4,r0,0x0l.sb 0x1(r3),r4l.addi r4,r0,0x3l.sb 0x3(r3),r4l.lbz r5,3(r3)l.ori r4,r5,0x80l.sb 0x3(r3),r4l.addi r4,r0,((UART_DEVISOR>>8) & 0x000000ff)l.sb UART_DLM(r3),r4l.addi r4,r0,((UART_DEVISOR) & 0x000000ff)l.sb UART_DLL(r3),r4l.sb 0x3(r3),r5l.jr r9l.nop_string_copying_linux:.string "\n\n\n\n\n\rCopying Linux... \0"_string_ok_booting:.string "Ok, booting the kernel.\n\r\0"_string_unhandled_exception:.string "\n\rRunarunaround: Unhandled exception 0x\0"_string_epc_prefix:.string ": EPC=0x\0"_string_nl:.string "\n\r\0"_string_debug_exception:.string "\n\r\tDebug: exception 0x\0"_string_debug_esr_prefix:.string ", ESR=0x\0"_string_debug_eear_prefix:.string ", EEAR=0x\0"_string_dcache_clean:.string "dcache cleaning\n\r\0"_string_icache_clean:.string "icache cleaning\n\r\0"_string_ic_invalidate:.string "\n\r\tic invalidate: \0"_string_ic_enable:.string "\n\ricache enabling\n\r\0"_string_dc_invalidate:.string "\n\r\tdc invalidate: \0"_string_dc_enable:.string "\n\rdcache enabling\n\r\0"_string_pbjds:.string "[jd]"_string_ed:.string "\n\r[debug] ".global _string_esr_irq_bug_string_esr_irq_bug:.string "\n\rESR external interrupt bug, for details look into entry.S\n\r\0"/* ========================================[ page aligned structures ]=== *//** .data section should be page aligned* (look into arch/or32/kernel/vmlinux.lds)*/.data.global _sdata_sdata:.align 8192.global _empty_zero_page_empty_zero_page:.space 8192.global _swapper_pg_dir_swapper_pg_dir:.space 8192.global _unhandled_stack_unhandled_stack:.space 8192_unhandled_stack_top:/* ============================================================[ EOF ]=== */