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/*
        Test of return from execption and MMU behavior
 
        For now, just a simple test confirming that the instructions we l.rfe
        to are executed OK.
 
        In this test we are checking that execution of instructions after
        l.rfe enabling the MMU occurs OK.
 
        Mainly this is to test what happens when the first virtual address
        after a l.rfe is a cache "hit" - ensuring this instruction is not
        executed.
 
        Test method:
        Relocate a simple looping function to an unused page in memory, at
        offset 0xf00 within that page. Translate virtual page 0 to this page
        and execute it, with timer interrupts occuring, ensuring the l.rfe is
        being called regularly.
 
        Whenever the function in virtual space is so be resumed, code at the
        address matching the virtual space is executed before the l.rfe,
        ensuring it is in cache. If any of these instructions in the physical
        address are executed, then the code running in virtual space will
        detect this and crash.
 
        In this instance, the test function is only about 30 instructions
        long. It is mapped to virtual address 0xf00. The physical address
        0xf00 has the same number of instructions, setting r31 to -1 (0xfffffff)
        This string of 32 instructions is executed before any l.rfe back to the
        function running with MMUs on in the virtual page address. The last
        instruction before the l.rfe clears r31, so if any of the instructions
        in the physical address space get executed, r31 will return to
        0xffffffff and this can be detected by the code.
 
        The test finishes when the test function, running in virtual address
        space, has incremented a value in memory beyond the alue defined by
        TEST_LOOPS.
 
        The test has the possibility of being restarted and run with
        caches enabled.
 
        Julius Baxter, ORSoC AB, julius.baxter@orsoc.se
 
 
*/
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
 
#include "spr-defs.h"
#include "board.h"
#include "or1200-defines.h"
 
#define ONCE_THROUGH_WITH_CACHE_ENABLED 1
 
#define TEST_LOOPS 0xffff
 
#define PAGE_ADR_SHIFT 13
 
// Should be at least 0x1000
#define PAGE_OFFSET_FOR_TEST 0xf00
 
#define TIMER_CYCLES_RATE 1000
 
#define LOAD_SYMBOL_2_GPR(gpr,symbol)  \
        l.movhi gpr, hi(symbol) ;      \
        l.ori   gpr, gpr, lo(symbol)
 
/* =================================================== [ exceptions ] === */
        .section .vectors, "ax"
 
/* ---[ 0x100: RESET exception ]----------------------------------------- */
        .org 0x100
        l.movhi r0, 0
        /* Clear status register */
        l.ori r1, r0, SPR_SR_SM
        l.mtspr r0, r1, SPR_SR
        /* Clear timer  */
        l.mtspr r0, r0, SPR_TTMR
 
        /* Jump to program initialisation code */
        .global _start
        l.movhi r4, hi(_start)
        l.ori r4, r4, lo(_start)
        l.jr    r4
        l.nop
 
/* ---[ 0x400: itlb fault ]--------------------------------------------- */
        .org 0x400
        l.ori   r3,r0,0xa00
        l.nop   0x2
        l.movhi r3,0xbaaa
        l.ori   r3,r3,0xaaad
        l.nop   0x2
        l.nop   0x1 /* We should never have a itlb miss */
 
/* ---[ 0x500: timer exception ]---------------------------------------- */
        .org 0x500
        /* check test loop counter to see if test is over */
        LOAD_SYMBOL_2_GPR(r3,function_global)
        l.lwz   r3,0(r3)
        l.sfgeui r3,TEST_LOOPS
        l.bf    check_for_restart
        l.nop
        /* Write to TTMR again to clear TTMR[IP] bit */
        l.jal   timer_load
        l.nop
 
        l.j     call_rfe        /* continue execution */
        l.nop
 
        .org 0x600
        l.j     fail
        l.nop
 
        .org 0x700
        l.j     fail
        l.nop
 
        .org 0x800
        l.j     fail
        l.nop
 
 
/* ---[ 0xa00: itlb miss ]---------------------------------------------- */
        .org 0xa00
        l.ori   r3,r0,0xa00
        l.nop   0x2
        l.movhi r3,0xbaaa
        l.ori   r3,r3,0xaaad
        l.nop   0x2
        l.j     0
        l.nop   0x1 /* We should never have a itlb miss */
 
/* ---[ 0xc00: system call ]-------------------------------------------- */
        .org 0xc00
        l.movhi r3,0xbaaa
        l.ori   r3,r3,0xaaad
        l.nop   0x2     /* Simulation report */
        l.j     0        /* Loop here */
        l.nop   0x1     /* End simulation */
 
/* ---[ 0xE00: TRAP exception ]----------------------------------------- */
        .org 0xe00
        l.j     0
        l.nop   0x1
 
/* ---[ reserved space        ]------------------------------------ */
        .org PAGE_OFFSET_FOR_TEST
call_rfe:
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.addi  r31,r0,-1
        l.movhi r31,0
        l.rfe
 
 
/* =================================================== [ text ] === */
        .section .data
immu_sets:
        .long -1
immu_ways:
        .long -1
dmmu_sets:
        .long -1
dmmu_ways:
        .long -1
test_page_num:
        .long -1
function_global:
        .long 0
 
 
/* =================================================== [ text ] === */
        .section .text
 
/* =================================================== [ start ] === */
 
        .global _start
_start:
 
#if ONCE_THROUGH_WITH_CACHE_ENABLED==1
        l.jal   _cache_init
        l.nop
#endif
 
        // Kick off test
        l.jal   _main
        l.nop
 
/* =================================================== [ main ] === */
        .global _main
_main:
        // Get MMU configuration
        l.jal   immu_get_config
        l.nop
        l.jal   dmmu_get_config
        l.nop
 
        // Clear IMMU
        l.jal   immu_clear
        l.nop
        // Clear DMMU
        l.jal   dmmu_clear
        l.nop
 
        // Set up stack pointer, but kind of don't need it
        LOAD_SYMBOL_2_GPR(r1,_stack)
 
        // What is next page above stack?
        l.srli  r4,r1,PAGE_ADR_SHIFT
        l.addi  r4,r4,1         /* Next page past */
        LOAD_SYMBOL_2_GPR(r5,test_page_num)
        l.sw    0(r5),r4        /* We will do tests with code in this PPN */
 
 
        LOAD_SYMBOL_2_GPR(r2,test_function)
        LOAD_SYMBOL_2_GPR(r3,test_function_end)
        /* Convert physical page number back to physical address */
        l.slli  r4,r4,PAGE_ADR_SHIFT
        /* r4 has physical address of where we'll relocate our test program to
        but we want it at an offset of PAGE_OFFSET_FOR_TEST inside that page.
        */
 
        l.addi  r4,r4,PAGE_OFFSET_FOR_TEST
program_relocate_loop:
        l.lwz   r5,0(r2)
        l.sw    0(r4),r5
        l.sfeq  r2,r3
        l.mtspr r0,r4,SPR_DCBIR /* flush dcache */
        l.addi  r4,r4,4         /* increment dest ptr */
        l.bnf   program_relocate_loop
        l.addi  r2,r2,4         /* increment src ptr */
 
mmu_setup:
        /* Program relocated, setup MMU mappings */
        /* Physical page number of test-code is in test_page_num. We need
        to set up a mapping for this page in the MMU, then launch execution
        of it.
        */
        LOAD_SYMBOL_2_GPR(r5,test_page_num)
        l.lwz   r5,0(r5)
        /* Basically should be match-PPN of 0 translates to page
        number test_page_num.
        Set up entry 0, then, and have translate address to test_page_num*/
        // Match register
        l.ori   r3,r0,SPR_ITLBMR_V      /* Just this */
        l.mtspr r0,r3,SPR_ITLBMR_BASE(0)
        // Setup TR page number
        l.slli  r3,r5,PAGE_ADR_SHIFT //r5 = page number of target page
        l.ori   r3,r3,ITLB_PR_NOLIMIT
        l.mtspr r0,r3,SPR_ITLBTR_BASE(0)
 
timer_setup:
        /* Init timer to fire at rate of TIMER_CYCLES_RATE */
        l.jal   timer_load
        l.nop
 
sr_setup:
        // Start test - set up EPCR to jump to PAGE_OFFSET_FOR_TEST
        l.ori   r3,r0,PAGE_OFFSET_FOR_TEST
        l.mtspr r0,r3,SPR_EPCR_BASE
 
        l.mfspr r3,r0,SPR_SR
        l.ori   r3,r3,(SPR_SR_IME|SPR_SR_TEE)   /* IMMU, tick timer enable */
        l.mtspr r0,r3,SPR_ESR_BASE
 
        // Ensure global counter variable is zero
        LOAD_SYMBOL_2_GPR(r3,function_global)
        l.sw    0(r3),r0
 
        // Call function entry point, check bug doesn't occur
        l.j     call_rfe
        l.nop
 
        // Should never get here - test is detected as finished from the
        // timer interrupt.
 
check_for_restart:
        l.mfspr r4,r0,SPR_SR
        l.andi  r4,r4,SPR_SR_ICE /* is instruction cache enabled? */
        l.sfgtu r4,r0
        l.bnf   restart_with_caches
        l.nop
 
finish:
        l.movhi r3,0x8000
        l.ori   r3,r3,0x000d
        l.nop   0x2
        l.j     0
        l.nop   0x1
 
fail:
        l.movhi r3,0xbaaa
        l.ori   r3,r3,0xaaad
        l.nop   0x2
        l.j     0
        l.nop   0x1
 
 
        /* A stilly test function - doing some loads/stores, and some
        branches
        only touches r13 and r14*/
        /* Should be relocatable */
test_function:
        // Check for error - r31 should be 0
        l.sfne  r31,r0
        l.bf    test_function_fail
 
        LOAD_SYMBOL_2_GPR(r13,function_global)
        l.lwz   r14,0(r13)      /* Load value of global */
        l.addi  r14,r14,1
        l.sw    0(r13),r14      /* Store it back */
        l.mtspr r0,r13,SPR_DCBIR /* flush dcache */
        /* Every 8, branch away and back */
        l.andi  r14,r14,0xf
        l.sfeq  r14,r0
        l.bf    test_function_sub
        l.nop
        l.j     test_function
        l.nop
 
test_function_sub:
        l.j     test_function
        l.nop
 
test_function_fail:
        l.sys   0 /* Bail out with syscall */
 
test_function_end:
        l.nop   0x1
 
 
 
restart_with_caches:
        l.jal   _cache_init
        l.nop
        l.movhi r4, hi(_start)
        l.ori r4, r4, lo(_start)
        l.jr    r4
        l.nop
 
 
        /* MMU configuration functions */
 
immu_get_config:
        l.mfspr r3,r0,SPR_IMMUCFGR
        // Number of ways
        l.andi  r4,r3,SPR_IMMUCFGR_NTW
        l.addi  r4,r4,1
        // Store the ways in immu_ways
        l.movhi r5,hi(immu_ways)
        l.ori   r5,r5,lo(immu_ways)
        l.sw    0(r5),r4
        // Number of sets
        l.andi  r4,r3,SPR_IMMUCFGR_NTS
        l.srli  r4,r4,SPR_IMMUCFGR_NTS_OFF
        l.ori   r6,r0,1
        l.sll   r4,r6,r4
        // Store the ways in immu_ways
        l.movhi r5,hi(immu_sets)
        l.ori   r5,r5,lo(immu_sets)
        l.jr    r9      // Return
        l.sw    0(r5),r4
 
dmmu_get_config:
        l.mfspr r3,r0,SPR_DMMUCFGR
        // Number of ways
        l.andi  r4,r3,SPR_DMMUCFGR_NTW
        l.addi  r4,r4,1
        // Store the ways in dmmu_ways
        l.movhi r5,hi(dmmu_ways)
        l.ori   r5,r5,lo(dmmu_ways)
        l.sw    0(r5),r4
        // Number of sets
        l.andi  r4,r3,SPR_DMMUCFGR_NTS
        l.srli  r4,r4,SPR_DMMUCFGR_NTS_OFF
        l.ori   r6,r0,1
        l.sll   r4,r6,r4
        // Store the ways in dmmu_ways
        l.movhi r5,hi(dmmu_sets)
        l.ori   r5,r5,lo(dmmu_sets)
        l.jr    r9      // Return
        l.sw    0(r5),r4
 
 
immu_clear:
        // r3 - immu_ways
        // r4 - immu_sets
        // r5 - work
        // r6 - ways counter
        // r7 - sets counter
        // r10 - match regs spr address
        // r11 - translate regs spr address
 
        /* Clear all IMMU match/translate register pairs */
        l.movhi r5,hi(immu_ways)
        l.ori   r5,r5,lo(immu_ways)
        l.lwz   r3,0(r5)
        l.movhi r5,hi(immu_sets)
        l.ori   r5,r5,lo(immu_sets)
        l.lwz   r4,0(r5)
 
        l.movhi r6, 0   // Clear ways counters
 
immu_clear_set:
        l.movhi r7, 0   // Clear sets counter
        // Calculate base of IMMU match & translate registers
        l.ori   r10,r0,SPR_ITLBMR_BASE(0)
        l.ori   r11,r0,SPR_ITLBTR_BASE(0)
        l.slli  r5,r6,8 /* Multiply ways by 256  (ways<<8) */
        l.add   r10,r10,r5
        l.add   r11,r11,r5
immu_clear_set_loop:
        l.mtspr r10,r0,0 /* ITLBMR_BASE(way) + set = 0 */
        l.mtspr r11,r0,0 /* ITLBTR_BASE(way) + set = 0 */
        l.addi  r7,r7,1
        l.sfne  r4,r7
        l.addi  r10,r10,1
        l.bf    immu_clear_set_loop
        l.addi  r11,r11,1
 
        l.addi  r6,r6,1 /* Increment ways counter */
        l.sfne  r3,r6   /* Cleared all ways? */
        l.bf    immu_clear_set
        l.nop
 
        /* Finished */
        l.jr    r9
        l.nop
 
dmmu_clear:
        // r3 - dmmu_ways
        // r4 - dmmu_sets
        // r5 - work
        // r6 - ways counter
        // r7 - sets counter
        // r10 - match regs spr address
        // r11 - translate regs spr address
 
        /* Clear all DMMU match/translate register pairs */
        l.movhi r5,hi(dmmu_ways)
        l.ori   r5,r5,lo(dmmu_ways)
        l.lwz   r3,0(r5)
        l.movhi r5,hi(dmmu_sets)
        l.ori   r5,r5,lo(dmmu_sets)
        l.lwz   r4,0(r5)
 
        l.movhi r6, 0   // Clear ways counters
 
dmmu_clear_set:
        l.movhi r7, 0   // Clear sets counter
        // Calculate base of DMMU match & translate registers
        l.ori   r10,r0,SPR_DTLBMR_BASE(0)
        l.ori   r11,r0,SPR_DTLBTR_BASE(0)
        l.slli  r5,r6,8 /* Multiply ways by 256  (ways<<8) */
        l.add   r10,r10,r5
        l.add   r11,r11,r5
dmmu_clear_set_loop:
        l.mtspr r10,r0,0 /* ITLBMR_BASE(way) + set = 0 */
        l.mtspr r11,r0,0 /* ITLBTR_BASE(way) + set = 0 */
        l.addi  r7,r7,1
        l.sfne  r4,r7
        l.addi  r10,r10,1
        l.bf    dmmu_clear_set_loop
        l.addi  r11,r11,1
 
        l.addi  r6,r6,1 /* Increment ways counter */
        l.sfne  r3,r6   /* Cleared all ways? */
        l.bf    dmmu_clear_set
        l.nop
 
        /* Finished */
        l.jr    r9
        l.nop
 
 
 
#define TTMR_RELOAD_VALUE (SPR_TTMR_IE | SPR_TTMR_RT | TIMER_CYCLES_RATE)
timer_load:
        l.movhi r3,hi(TTMR_RELOAD_VALUE)
        l.ori   r3,r3,lo(TTMR_RELOAD_VALUE)
        l.jr r9
        l.mtspr r0,r3,SPR_TTMR

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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [tests/] [or1200/] [board/] [or1200-rfemmu.S] - Blame information for rev 535

Line No.	Rev	Author	Line
1	535	julius	`/*`
2			`Test of return from execption and MMU behavior`
3
4			`For now, just a simple test confirming that the instructions we l.rfe`
5			`to are executed OK.`
6
7			`In this test we are checking that execution of instructions after`
8			`l.rfe enabling the MMU occurs OK.`
9
10			`Mainly this is to test what happens when the first virtual address`
11			`after a l.rfe is a cache "hit" - ensuring this instruction is not`
12			`executed.`
13
14			`Test method:`
15			`Relocate a simple looping function to an unused page in memory, at`
16			`offset 0xf00 within that page. Translate virtual page 0 to this page`
17			`and execute it, with timer interrupts occuring, ensuring the l.rfe is`
18			`being called regularly.`
19
20			`Whenever the function in virtual space is so be resumed, code at the`
21			`address matching the virtual space is executed before the l.rfe,`
22			`ensuring it is in cache. If any of these instructions in the physical`
23			`address are executed, then the code running in virtual space will`
24			`detect this and crash.`
25
26			`In this instance, the test function is only about 30 instructions`
27			`long. It is mapped to virtual address 0xf00. The physical address`
28			`0xf00 has the same number of instructions, setting r31 to -1 (0xfffffff)`
29			`This string of 32 instructions is executed before any l.rfe back to the`
30			`function running with MMUs on in the virtual page address. The last`
31			`instruction before the l.rfe clears r31, so if any of the instructions`
32			`in the physical address space get executed, r31 will return to`
33			`0xffffffff and this can be detected by the code.`
34
35			`The test finishes when the test function, running in virtual address`
36			`space, has incremented a value in memory beyond the alue defined by`
37			`TEST_LOOPS.`
38
39			`The test has the possibility of being restarted and run with`
40			`caches enabled.`
41
42			`Julius Baxter, ORSoC AB, julius.baxter@orsoc.se`
43
44
45			`*/`
46			`//////////////////////////////////////////////////////////////////////`
47			`//// ////`
48			`//// Copyright (C) 2010 Authors and OPENCORES.ORG ////`
49			`//// ////`
50			`//// This source file may be used and distributed without ////`
51			`//// restriction provided that this copyright statement is not ////`
52			`//// removed from the file and that any derivative work contains ////`
53			`//// the original copyright notice and the associated disclaimer. ////`
54			`//// ////`
55			`//// This source file is free software; you can redistribute it ////`
56			`//// and/or modify it under the terms of the GNU Lesser General ////`
57			`//// Public License as published by the Free Software Foundation; ////`
58			`//// either version 2.1 of the License, or (at your option) any ////`
59			`//// later version. ////`
60			`//// ////`
61			`//// This source is distributed in the hope that it will be ////`
62			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
63			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
64			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
65			`//// details. ////`
66			`//// ////`
67			`//// You should have received a copy of the GNU Lesser General ////`
68			`//// Public License along with this source; if not, download it ////`
69			`//// from http://www.opencores.org/lgpl.shtml ////`
70			`//// ////`
71			`//////////////////////////////////////////////////////////////////////`
72
73			`#include "spr-defs.h"`
74			`#include "board.h"`
75			`#include "or1200-defines.h"`
76
77			`#define ONCE_THROUGH_WITH_CACHE_ENABLED 1`
78
79			`#define TEST_LOOPS 0xffff`
80
81			`#define PAGE_ADR_SHIFT 13`
82
83			`// Should be at least 0x1000`
84			`#define PAGE_OFFSET_FOR_TEST 0xf00`
85
86			`#define TIMER_CYCLES_RATE 1000`
87
88			`#define LOAD_SYMBOL_2_GPR(gpr,symbol) \`
89			`l.movhi gpr, hi(symbol) ; \`
90			`l.ori gpr, gpr, lo(symbol)`
91
92			`/* =================================================== [ exceptions ] === */`
93			`.section .vectors, "ax"`
94
95			`/* ---[ 0x100: RESET exception ]----------------------------------------- */`
96			`.org 0x100`
97			`l.movhi r0, 0`
98			`/* Clear status register */`
99			`l.ori r1, r0, SPR_SR_SM`
100			`l.mtspr r0, r1, SPR_SR`
101			`/* Clear timer */`
102			`l.mtspr r0, r0, SPR_TTMR`
103
104			`/* Jump to program initialisation code */`
105			`.global _start`
106			`l.movhi r4, hi(_start)`
107			`l.ori r4, r4, lo(_start)`
108			`l.jr r4`
109			`l.nop`
110
111			`/* ---[ 0x400: itlb fault ]--------------------------------------------- */`
112			`.org 0x400`
113			`l.ori r3,r0,0xa00`
114			`l.nop 0x2`
115			`l.movhi r3,0xbaaa`
116			`l.ori r3,r3,0xaaad`
117			`l.nop 0x2`
118			`l.nop 0x1 /* We should never have a itlb miss */`
119
120			`/* ---[ 0x500: timer exception ]---------------------------------------- */`
121			`.org 0x500`
122			`/* check test loop counter to see if test is over */`
123			`LOAD_SYMBOL_2_GPR(r3,function_global)`
124			`l.lwz r3,0(r3)`
125			`l.sfgeui r3,TEST_LOOPS`
126			`l.bf check_for_restart`
127			`l.nop`
128			`/* Write to TTMR again to clear TTMR[IP] bit */`
129			`l.jal timer_load`
130			`l.nop`
131
132			`l.j call_rfe /* continue execution */`
133			`l.nop`
134
135			`.org 0x600`
136			`l.j fail`
137			`l.nop`
138
139			`.org 0x700`
140			`l.j fail`
141			`l.nop`
142
143			`.org 0x800`
144			`l.j fail`
145			`l.nop`
146
147
148			`/* ---[ 0xa00: itlb miss ]---------------------------------------------- */`
149			`.org 0xa00`
150			`l.ori r3,r0,0xa00`
151			`l.nop 0x2`
152			`l.movhi r3,0xbaaa`
153			`l.ori r3,r3,0xaaad`
154			`l.nop 0x2`
155			`l.j 0`
156			`l.nop 0x1 /* We should never have a itlb miss */`
157
158			`/* ---[ 0xc00: system call ]-------------------------------------------- */`
159			`.org 0xc00`
160			`l.movhi r3,0xbaaa`
161			`l.ori r3,r3,0xaaad`
162			`l.nop 0x2 /* Simulation report */`
163			`l.j 0 /* Loop here */`
164			`l.nop 0x1 /* End simulation */`
165
166			`/* ---[ 0xE00: TRAP exception ]----------------------------------------- */`
167			`.org 0xe00`
168			`l.j 0`
169			`l.nop 0x1`
170
171			`/* ---[ reserved space ]------------------------------------ */`
172			`.org PAGE_OFFSET_FOR_TEST`
173			`call_rfe:`
174			`l.addi r31,r0,-1`
175			`l.addi r31,r0,-1`
176			`l.addi r31,r0,-1`
177			`l.addi r31,r0,-1`
178			`l.addi r31,r0,-1`
179			`l.addi r31,r0,-1`
180			`l.addi r31,r0,-1`
181			`l.addi r31,r0,-1`
182			`l.addi r31,r0,-1`
183			`l.addi r31,r0,-1`
184			`l.addi r31,r0,-1`
185			`l.addi r31,r0,-1`
186			`l.addi r31,r0,-1`
187			`l.addi r31,r0,-1`
188			`l.addi r31,r0,-1`
189			`l.addi r31,r0,-1`
190			`l.addi r31,r0,-1`
191			`l.addi r31,r0,-1`
192			`l.addi r31,r0,-1`
193			`l.addi r31,r0,-1`
194			`l.addi r31,r0,-1`
195			`l.addi r31,r0,-1`
196			`l.addi r31,r0,-1`
197			`l.addi r31,r0,-1`
198			`l.addi r31,r0,-1`
199			`l.addi r31,r0,-1`
200			`l.addi r31,r0,-1`
201			`l.addi r31,r0,-1`
202			`l.addi r31,r0,-1`
203			`l.movhi r31,0`
204			`l.rfe`
205
206
207			`/* =================================================== [ text ] === */`
208			`.section .data`
209			`immu_sets:`
210			`.long -1`
211			`immu_ways:`
212			`.long -1`
213			`dmmu_sets:`
214			`.long -1`
215			`dmmu_ways:`
216			`.long -1`
217			`test_page_num:`
218			`.long -1`
219			`function_global:`
220			`.long 0`
221
222
223			`/* =================================================== [ text ] === */`
224			`.section .text`
225
226			`/* =================================================== [ start ] === */`
227
228			`.global _start`
229			`_start:`
230
231			`#if ONCE_THROUGH_WITH_CACHE_ENABLED==1`
232			`l.jal _cache_init`
233			`l.nop`
234			`#endif`
235
236			`// Kick off test`
237			`l.jal _main`
238			`l.nop`
239
240			`/* =================================================== [ main ] === */`
241			`.global _main`
242			`_main:`
243			`// Get MMU configuration`
244			`l.jal immu_get_config`
245			`l.nop`
246			`l.jal dmmu_get_config`
247			`l.nop`
248
249			`// Clear IMMU`
250			`l.jal immu_clear`
251			`l.nop`
252			`// Clear DMMU`
253			`l.jal dmmu_clear`
254			`l.nop`
255
256			`// Set up stack pointer, but kind of don't need it`
257			`LOAD_SYMBOL_2_GPR(r1,_stack)`
258
259			`// What is next page above stack?`
260			`l.srli r4,r1,PAGE_ADR_SHIFT`
261			`l.addi r4,r4,1 /* Next page past */`
262			`LOAD_SYMBOL_2_GPR(r5,test_page_num)`
263			`l.sw 0(r5),r4 /* We will do tests with code in this PPN */`
264
265
266			`LOAD_SYMBOL_2_GPR(r2,test_function)`
267			`LOAD_SYMBOL_2_GPR(r3,test_function_end)`
268			`/* Convert physical page number back to physical address */`
269			`l.slli r4,r4,PAGE_ADR_SHIFT`
270			`/* r4 has physical address of where we'll relocate our test program to`
271			`but we want it at an offset of PAGE_OFFSET_FOR_TEST inside that page.`
272			`*/`
273
274			`l.addi r4,r4,PAGE_OFFSET_FOR_TEST`
275			`program_relocate_loop:`
276			`l.lwz r5,0(r2)`
277			`l.sw 0(r4),r5`
278			`l.sfeq r2,r3`
279			`l.mtspr r0,r4,SPR_DCBIR /* flush dcache */`
280			`l.addi r4,r4,4 /* increment dest ptr */`
281			`l.bnf program_relocate_loop`
282			`l.addi r2,r2,4 /* increment src ptr */`
283
284			`mmu_setup:`
285			`/* Program relocated, setup MMU mappings */`
286			`/* Physical page number of test-code is in test_page_num. We need`
287			`to set up a mapping for this page in the MMU, then launch execution`
288			`of it.`
289			`*/`
290			`LOAD_SYMBOL_2_GPR(r5,test_page_num)`
291			`l.lwz r5,0(r5)`
292			`/* Basically should be match-PPN of 0 translates to page`
293			`number test_page_num.`
294			`Set up entry 0, then, and have translate address to test_page_num*/`
295			`// Match register`
296			`l.ori r3,r0,SPR_ITLBMR_V /* Just this */`
297			`l.mtspr r0,r3,SPR_ITLBMR_BASE(0)`
298			`// Setup TR page number`
299			`l.slli r3,r5,PAGE_ADR_SHIFT //r5 = page number of target page`
300			`l.ori r3,r3,ITLB_PR_NOLIMIT`
301			`l.mtspr r0,r3,SPR_ITLBTR_BASE(0)`
302
303			`timer_setup:`
304			`/* Init timer to fire at rate of TIMER_CYCLES_RATE */`
305			`l.jal timer_load`
306			`l.nop`
307
308			`sr_setup:`
309			`// Start test - set up EPCR to jump to PAGE_OFFSET_FOR_TEST`
310			`l.ori r3,r0,PAGE_OFFSET_FOR_TEST`
311			`l.mtspr r0,r3,SPR_EPCR_BASE`
312
313			`l.mfspr r3,r0,SPR_SR`
314			`l.ori r3,r3,(SPR_SR_IME\|SPR_SR_TEE) /* IMMU, tick timer enable */`
315			`l.mtspr r0,r3,SPR_ESR_BASE`
316
317			`// Ensure global counter variable is zero`
318			`LOAD_SYMBOL_2_GPR(r3,function_global)`
319			`l.sw 0(r3),r0`
320
321			`// Call function entry point, check bug doesn't occur`
322			`l.j call_rfe`
323			`l.nop`
324
325			`// Should never get here - test is detected as finished from the`
326			`// timer interrupt.`
327
328			`check_for_restart:`
329			`l.mfspr r4,r0,SPR_SR`
330			`l.andi r4,r4,SPR_SR_ICE /* is instruction cache enabled? */`
331			`l.sfgtu r4,r0`
332			`l.bnf restart_with_caches`
333			`l.nop`
334
335			`finish:`
336			`l.movhi r3,0x8000`
337			`l.ori r3,r3,0x000d`
338			`l.nop 0x2`
339			`l.j 0`
340			`l.nop 0x1`
341
342			`fail:`
343			`l.movhi r3,0xbaaa`
344			`l.ori r3,r3,0xaaad`
345			`l.nop 0x2`
346			`l.j 0`
347			`l.nop 0x1`
348
349
350			`/* A stilly test function - doing some loads/stores, and some`
351			`branches`
352			`only touches r13 and r14*/`
353			`/* Should be relocatable */`
354			`test_function:`
355			`// Check for error - r31 should be 0`
356			`l.sfne r31,r0`
357			`l.bf test_function_fail`
358
359			`LOAD_SYMBOL_2_GPR(r13,function_global)`
360			`l.lwz r14,0(r13) /* Load value of global */`
361			`l.addi r14,r14,1`
362			`l.sw 0(r13),r14 /* Store it back */`
363			`l.mtspr r0,r13,SPR_DCBIR /* flush dcache */`
364			`/* Every 8, branch away and back */`
365			`l.andi r14,r14,0xf`
366			`l.sfeq r14,r0`
367			`l.bf test_function_sub`
368			`l.nop`
369			`l.j test_function`
370			`l.nop`
371
372			`test_function_sub:`
373			`l.j test_function`
374			`l.nop`
375
376			`test_function_fail:`
377			`l.sys 0 /* Bail out with syscall */`
378
379			`test_function_end:`
380			`l.nop 0x1`
381
382
383
384			`restart_with_caches:`
385			`l.jal _cache_init`
386			`l.nop`
387			`l.movhi r4, hi(_start)`
388			`l.ori r4, r4, lo(_start)`
389			`l.jr r4`
390			`l.nop`
391
392
393			`/* MMU configuration functions */`
394
395			`immu_get_config:`
396			`l.mfspr r3,r0,SPR_IMMUCFGR`
397			`// Number of ways`
398			`l.andi r4,r3,SPR_IMMUCFGR_NTW`
399			`l.addi r4,r4,1`
400			`// Store the ways in immu_ways`
401			`l.movhi r5,hi(immu_ways)`
402			`l.ori r5,r5,lo(immu_ways)`
403			`l.sw 0(r5),r4`
404			`// Number of sets`
405			`l.andi r4,r3,SPR_IMMUCFGR_NTS`
406			`l.srli r4,r4,SPR_IMMUCFGR_NTS_OFF`
407			`l.ori r6,r0,1`
408			`l.sll r4,r6,r4`
409			`// Store the ways in immu_ways`
410			`l.movhi r5,hi(immu_sets)`
411			`l.ori r5,r5,lo(immu_sets)`
412			`l.jr r9 // Return`
413			`l.sw 0(r5),r4`
414
415			`dmmu_get_config:`
416			`l.mfspr r3,r0,SPR_DMMUCFGR`
417			`// Number of ways`
418			`l.andi r4,r3,SPR_DMMUCFGR_NTW`
419			`l.addi r4,r4,1`
420			`// Store the ways in dmmu_ways`
421			`l.movhi r5,hi(dmmu_ways)`
422			`l.ori r5,r5,lo(dmmu_ways)`
423			`l.sw 0(r5),r4`
424			`// Number of sets`
425			`l.andi r4,r3,SPR_DMMUCFGR_NTS`
426			`l.srli r4,r4,SPR_DMMUCFGR_NTS_OFF`
427			`l.ori r6,r0,1`
428			`l.sll r4,r6,r4`
429			`// Store the ways in dmmu_ways`
430			`l.movhi r5,hi(dmmu_sets)`
431			`l.ori r5,r5,lo(dmmu_sets)`
432			`l.jr r9 // Return`
433			`l.sw 0(r5),r4`
434
435
436			`immu_clear:`
437			`// r3 - immu_ways`
438			`// r4 - immu_sets`
439			`// r5 - work`
440			`// r6 - ways counter`
441			`// r7 - sets counter`
442			`// r10 - match regs spr address`
443			`// r11 - translate regs spr address`
444
445			`/* Clear all IMMU match/translate register pairs */`
446			`l.movhi r5,hi(immu_ways)`
447			`l.ori r5,r5,lo(immu_ways)`
448			`l.lwz r3,0(r5)`
449			`l.movhi r5,hi(immu_sets)`
450			`l.ori r5,r5,lo(immu_sets)`
451			`l.lwz r4,0(r5)`
452
453			`l.movhi r6, 0 // Clear ways counters`
454
455			`immu_clear_set:`
456			`l.movhi r7, 0 // Clear sets counter`
457			`// Calculate base of IMMU match & translate registers`
458			`l.ori r10,r0,SPR_ITLBMR_BASE(0)`
459			`l.ori r11,r0,SPR_ITLBTR_BASE(0)`
460			`l.slli r5,r6,8 /* Multiply ways by 256 (ways<<8) */`
461			`l.add r10,r10,r5`
462			`l.add r11,r11,r5`
463			`immu_clear_set_loop:`
464			`l.mtspr r10,r0,0 /* ITLBMR_BASE(way) + set = 0 */`
465			`l.mtspr r11,r0,0 /* ITLBTR_BASE(way) + set = 0 */`
466			`l.addi r7,r7,1`
467			`l.sfne r4,r7`
468			`l.addi r10,r10,1`
469			`l.bf immu_clear_set_loop`
470			`l.addi r11,r11,1`
471
472			`l.addi r6,r6,1 /* Increment ways counter */`
473			`l.sfne r3,r6 /* Cleared all ways? */`
474			`l.bf immu_clear_set`
475			`l.nop`
476
477			`/* Finished */`
478			`l.jr r9`
479			`l.nop`
480
481			`dmmu_clear:`
482			`// r3 - dmmu_ways`
483			`// r4 - dmmu_sets`
484			`// r5 - work`
485			`// r6 - ways counter`
486			`// r7 - sets counter`
487			`// r10 - match regs spr address`
488			`// r11 - translate regs spr address`
489
490			`/* Clear all DMMU match/translate register pairs */`
491			`l.movhi r5,hi(dmmu_ways)`
492			`l.ori r5,r5,lo(dmmu_ways)`
493			`l.lwz r3,0(r5)`
494			`l.movhi r5,hi(dmmu_sets)`
495			`l.ori r5,r5,lo(dmmu_sets)`
496			`l.lwz r4,0(r5)`
497
498			`l.movhi r6, 0 // Clear ways counters`
499
500			`dmmu_clear_set:`
501			`l.movhi r7, 0 // Clear sets counter`
502			`// Calculate base of DMMU match & translate registers`
503			`l.ori r10,r0,SPR_DTLBMR_BASE(0)`
504			`l.ori r11,r0,SPR_DTLBTR_BASE(0)`
505			`l.slli r5,r6,8 /* Multiply ways by 256 (ways<<8) */`
506			`l.add r10,r10,r5`
507			`l.add r11,r11,r5`
508			`dmmu_clear_set_loop:`
509			`l.mtspr r10,r0,0 /* ITLBMR_BASE(way) + set = 0 */`
510			`l.mtspr r11,r0,0 /* ITLBTR_BASE(way) + set = 0 */`
511			`l.addi r7,r7,1`
512			`l.sfne r4,r7`
513			`l.addi r10,r10,1`
514			`l.bf dmmu_clear_set_loop`
515			`l.addi r11,r11,1`
516
517			`l.addi r6,r6,1 /* Increment ways counter */`
518			`l.sfne r3,r6 /* Cleared all ways? */`
519			`l.bf dmmu_clear_set`
520			`l.nop`
521
522			`/* Finished */`
523			`l.jr r9`
524			`l.nop`
525
526
527
528			`#define TTMR_RELOAD_VALUE (SPR_TTMR_IE \| SPR_TTMR_RT \| TIMER_CYCLES_RATE)`
529			`timer_load:`
530			`l.movhi r3,hi(TTMR_RELOAD_VALUE)`
531			`l.ori r3,r3,lo(TTMR_RELOAD_VALUE)`
532			`l.jr r9`
533			`l.mtspr r0,r3,SPR_TTMR`