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#ifndef CYGONCE_HAL_ARCH_H #define CYGONCE_HAL_ARCH_H //========================================================================== // // hal_arch.h // // Architecture specific abstractions // //========================================================================== // ####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later // version. // // eCos 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 General Public License // for more details. // // You should have received a copy of the GNU General Public License // along with eCos; if not, write to the Free Software Foundation, Inc., // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // As a special exception, if other files instantiate templates or use // macros or inline functions from this file, or you compile this file // and link it with other works to produce a work based on this file, // this file does not by itself cause the resulting work to be covered by // the GNU General Public License. However the source code for this file // must still be made available in accordance with section (3) of the GNU // General Public License v2. // // This exception does not invalidate any other reasons why a work based // on this file might be covered by the GNU General Public License. // ------------------------------------------- // ####ECOSGPLCOPYRIGHTEND#### //========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): nickg, gthomas, hmt // Contributors: nickg, gthomas, hmt // Date: 1999-02-20 // Purpose: Define architecture abstractions // Usage: #include <cyg/hal/hal_arch.h> // //####DESCRIPTIONEND#### // //========================================================================== #include <pkgconf/hal.h> #include <pkgconf/hal_sparc.h> #include <cyg/infra/cyg_type.h> #include <cyg/hal/hal_intr.h> // HAL_DISABLE_INTERRUPTS //-------------------------------------------------------------------------- // Processor saved states: // // All these structures must be doubleword (64 bit) aligned. // The code that creates them on the stack will ensure this is so. #define HAL_THREAD_CONTEXT_GLOBAL_BASE 0 #define HAL_THREAD_CONTEXT_OUT_BASE 8 #define HAL_THREAD_CONTEXT_LOCAL_BASE 16 #define HAL_THREAD_CONTEXT_IN_BASE 24 typedef struct { // this is the save structure found at *(stack_ptr) always, note that // i[6] is the frame pointer is the previous stack pointer, and // o[6] is the stack pointer is the next frame pointer, // so they form a linked list back up the call stack. cyg_uint32 l[8]; /* Locals r16-r23 */ cyg_uint32 i[8]; /* Ins r24-r31 */ } HAL_SavedWindow; typedef struct { // Window save at stack pointer HAL_SavedWindow li; //16 // This is the rest of the save state: // NOTE: g[0] is used for the CWP, for %g0 == 0. Also note that the // assembler routines must load/store it in the right order. cyg_uint32 g[8] ; /* Globals r0- r7 */ cyg_uint32 o[8] ; /* Outs r8-r15 */ //32 words in size // There is no need to save any other state; for example, condition codes, // the PC and NextPC, and Y, are preserved in local registers in the trap // handling window and so preserved in the caller stack frame as viewed // from an ISR. Note that the VSR is jumped to with those locals being set // up (and Y in situ), and it must preserve them itself before calling any // subsequent handlers (ISRs). } HAL_SavedRegisters; typedef struct { // Window save at stack pointer HAL_SavedWindow li; cyg_uint32 composite_return_ptr; /* structure returns */ cyg_uint32 spill_args[6]; /* for callee to store */ cyg_uint32 spare; /* keep this 64-bits */ } HAL_FrameStructure; //-------------------------------------------------------------------------- // Exception handling function. // This function is defined by the kernel according to this prototype. It is // invoked from the HAL to deal with any CPU exceptions that the HAL does // not want to deal with itself. It usually invokes the kernel's exception // delivery mechanism. externC void cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data ); //-------------------------------------------------------------------------- // Bit manipulation macros #ifndef CYGPKG_HAL_SPARC_SCAN /* Most sparc's does not have 'scan' instruction */ externC cyg_uint32 hal_lsbit_index(cyg_uint32 mask); externC cyg_uint32 hal_msbit_index(cyg_uint32 mask); #define HAL_LSBIT_INDEX(index, mask) index = hal_lsbit_index(mask); #define HAL_MSBIT_INDEX(index, mask) index = hal_msbit_index(mask); #else #define HAL_LSBIT_INDEX(index, mask) \ CYG_MACRO_START \ asm volatile ( \ "scan %1, 0, %%l7;" \ "mov 31, %0;" \ "sub %0, %%l7, %0" \ : "=r"(index) \ : "r"(mask & ~(mask-1)) \ : "l7" \ ); \ CYG_MACRO_END #define HAL_MSBIT_INDEX(index, mask) \ CYG_MACRO_START \ asm volatile ( \ "scan %1, 0, %%l7;" \ "mov 31, %0;" \ "sub %0, %%l7, %0" \ : "=r"(index) \ : "r"(mask) \ : "l7" \ ); \ CYG_MACRO_END #endif //-------------------------------------------------------------------------- // Context Initialization // Initialize the context of a thread. // Arguments: // _sparg_ name of variable containing current sp, will be written with new sp // _thread_ thread object address, passed as argument to entry point // _entry_ entry point address. // _id_ bit pattern used in initializing registers, for debugging. externC CYG_ADDRESS hal_thread_init_context( CYG_WORD sparg, CYG_WORD thread, CYG_WORD entry, CYG_WORD id ); #define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ ) \ CYG_MACRO_START \ _sparg_ = hal_thread_init_context( (CYG_WORD)(_sparg_), \ (CYG_WORD)(_thread_), \ (CYG_WORD)(_entry_), \ (CYG_WORD)(_id_) ); \ CYG_MACRO_END //--------------------------------------------------------------------------- // Context switch macros. // The arguments are pointers to locations where the stack pointer // of the current thread is to be stored, and from where the sp of the // next thread is to be fetched. externC void hal_thread_switch_context( CYG_ADDRESS to, CYG_ADDRESS from ); externC void hal_thread_load_context( CYG_ADDRESS to ) __attribute__ ((noreturn)); #define HAL_THREAD_SWITCH_CONTEXT(_fspptr_,_tspptr_) \ hal_thread_switch_context((CYG_ADDRESS)_tspptr_, \ (CYG_ADDRESS)_fspptr_); #define HAL_THREAD_LOAD_CONTEXT(_tspptr_) \ hal_thread_load_context( (CYG_ADDRESS)_tspptr_ ); //--------------------------------------------------------------------------- // Execution reorder barrier. // When optimizing the compiler can reorder code. In multithreaded systems // where the order of actions is vital, this can sometimes cause problems. // This macro may be inserted into places where reordering should not happen. #define HAL_REORDER_BARRIER() asm volatile ( "" : : : "memory" ) //--------------------------------------------------------------------------- // Breakpoint support // HAL_BREAKPOINT() is a code sequence that will cause a breakpoint to happen // if executed. // HAL_BREAKINST is the value of the breakpoint instruction and // HAL_BREAKINST_SIZE is its size in bytes. #define HAL_BREAKPOINT(_label_) \ asm volatile (" .globl " #_label_ ";" \ #_label_":" \ "ta 1" \ ); #define HAL_BREAKINST {0x91,0xd0,0x20,0x01} #define HAL_BREAKINST_SIZE 4 //--------------------------------------------------------------------------- // Thread register state manipulation for GDB support. // Translate a stack pointer as saved by the thread context macros above into // a pointer to a HAL_SavedRegisters structure. #define HAL_THREAD_GET_SAVED_REGISTERS( _sp_, _regs_ ) \ (_regs_) = (HAL_SavedRegisters *)(_sp_) // Routines in icontext.c used here because they're quite large for // the SPARC (note param order): externC void cyg_hal_sparc_get_gdb_regs( void *gdb_regset, HAL_SavedRegisters *eCos_regset ); externC void cyg_hal_sparc_set_gdb_regs( HAL_SavedRegisters *eCos_regset, void *gdb_regset ); // Copy a set of registers from a HAL_SavedRegisters structure into a GDB // ordered array. #define HAL_GET_GDB_REGISTERS( _aregval_, _regs_ ) \ CYG_MACRO_START \ cyg_hal_sparc_get_gdb_regs( (_aregval_), (_regs_) ); \ CYG_MACRO_END // Copy a GDB ordered array into a HAL_SavedRegisters structure. #define HAL_SET_GDB_REGISTERS( _regs_ , _aregval_ ) \ CYG_MACRO_START \ cyg_hal_sparc_set_gdb_regs( (_regs_), (_aregval_) ); \ CYG_MACRO_END //--------------------------------------------------------------------------- // HAL setjmp #define CYGARC_JMP_BUF_SIZE 32 // (words) // this too must be doubleword aligned (64 bit) typedef cyg_uint64 hal_jmp_buf[ CYGARC_JMP_BUF_SIZE / 2 ]; externC int hal_setjmp(hal_jmp_buf env); externC void hal_longjmp(hal_jmp_buf env, int val); //--------------------------------------------------------------------------- // Flush Register Windows // // This is implemented as trap 3 in some SPARC systems. // This macro is only for use from normal, foreground code. // (including exception handlers and the like) #define HAL_FLUSH_REGISTERS_TO_STACK() \ CYG_MACRO_START \ cyg_uint32 _saveintr_; \ HAL_DISABLE_INTERRUPTS( _saveintr_ ); /* leave traps on */ \ asm volatile ( \ /* force out all our callers register sets onto the stack */ \ /* if necessary: the system will handily take care of this for */ \ /* us as follows: */ \ "save %%sp, -16 * 4, %%sp;" /* need all these to preserve */ \ "save %%sp, -16 * 4, %%sp;" /* the linked list property... */ \ "save %%sp, -16 * 4, %%sp;" \ "save %%sp, -16 * 4, %%sp;" \ "save %%sp, -16 * 4, %%sp;" \ "save %%sp, -16 * 4, %%sp;" \ "restore;" \ "restore;" \ "restore;" \ "restore;" \ "restore;" \ "restore" \ /* six of these is correct; a seventh would force out the */ \ /* current set that we are using right now. Note that minimal */ \ /* space is allowed on stack for locals and ins in case this */ \ /* sequence itself gets interrupted and recurses too deep. */ \ : \ : \ : "memory" \ ); \ HAL_RESTORE_INTERRUPTS( _saveintr_ ); \ CYG_MACRO_END //--------------------------------------------------------------------------- // Idle thread code. // This macro is called in the idle thread loop, and gives the HAL the // chance to insert code. Typical idle thread behaviour might be to halt the // processor. externC void hal_idle_thread_action(cyg_uint32 loop_count); #ifndef HAL_IDLE_THREAD_ACTION #define HAL_IDLE_THREAD_ACTION(_count_) \ /* Cyg_Clock::real_time_clock->tick() */ #endif //--------------------------------------------------------------------------- // Minimal and sensible stack sizes: the intention is that applications // will use these to provide a stack size in the first instance prior to // proper analysis. Idle thread stack should be this big. // THESE ARE NOT INTENDED TO BE MICROMETRICALLY ACCURATE FIGURES. // THEY ARE HOWEVER ENOUGH TO START PROGRAMMING. // YOU MUST MAKE YOUR STACKS LARGER IF YOU HAVE LARGE "AUTO" VARIABLES! // We define quite large stack needs for SPARC, for it requires 576 // bytes (144 words) to process an interrupt and thread-switch, and // momentarily, but needed in case of recursive interrupts, it needs 208 // words - if a sequence of saves to push out other regsets is interrupted. // This is not a config option because it should not be adjusted except // under "enough rope" sort of disclaimers. // A minimal, optimized stack frame is 24 words, but even -O2 code seems to // place a few locals in the locals area: round this up to provide a // sensible overestimate: #define CYGNUM_HAL_STACK_FRAME_SIZE (4 * 32) // Stack needed for a context switch: this is implicit in the estimate for // interrupts so not explicitly used below: #define CYGNUM_HAL_STACK_CONTEXT_SIZE (4 * 32) // Interrupt + call to ISR, interrupt_end() and the DSR #define CYGNUM_HAL_STACK_INTERRUPT_SIZE \ ((208 * 4) + 2 * CYGNUM_HAL_STACK_FRAME_SIZE) // And we have lots of registers so no particular amount is added in for // typical local variable usage. // Typically we have 4 nestable interrupt sources, clock, serialin, // serialout, (and NMI button, but you want it to not destroy context): #define CYGNUM_HAL_STACK_SIZE_MINIMUM \ (4 * CYGNUM_HAL_STACK_INTERRUPT_SIZE + 2 * CYGNUM_HAL_STACK_FRAME_SIZE) #define CYGNUM_HAL_STACK_SIZE_TYPICAL \ (CYGNUM_HAL_STACK_SIZE_MINIMUM + 8 * CYGNUM_HAL_STACK_FRAME_SIZE) //-------------------------------------------------------------------------- // Macros for switching context between two eCos instances (jump from // code in ROM to code in RAM or vice versa). #define CYGARC_HAL_SAVE_GP() #define CYGARC_HAL_RESTORE_GP() //----------------------------------------------------------------------------- #endif // CYGONCE_HAL_ARCH_H // End of hal_arch.h
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