Mercurial > ecos
view packages/hal/i386/arch/current/include/arch.inc @ 208:e0c0827131d1 ecos
Merge from eCos master repository on 2002-05-20-20:11:54-BST
| author | jlarmour |
|---|---|
| date | Mon, 20 May 2002 22:19:26 +0000 |
| parents | 8147f1c99f15 |
| children | d2c90368aeef |
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#ifndef CYGONCE_HAL_ARCH_INC #define CYGONCE_HAL_ARCH_INC ##============================================================================= ## ## arch.inc ## ## i386 assembler header file ## ##============================================================================= #####ECOSGPLCOPYRIGHTBEGIN#### # ------------------------------------------- # This file is part of eCos, the Embedded Configurable Operating System. # Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, 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., # 59 Temple Place, Suite 330, Boston, MA 02111-1307 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. # # This exception does not invalidate any other reasons why a work based on # this file might be covered by the GNU General Public License. # # Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. # at http://sources.redhat.com/ecos/ecos-license # ------------------------------------------- #####ECOSGPLCOPYRIGHTEND#### ##============================================================================= #######DESCRIPTIONBEGIN#### ## ## Author(s): nickg ## Contributors: nickg, pjo ## Date: 1999-10-15 ## Purpose: Architecture definitions. ## Description: This file contains various definitions and macros that are ## useful for writing assembly code for the i386 CPU family. ## Usage: ## #include <cyg/hal/arch.inc> ## ... ## ## ######DESCRIPTIONEND#### ## ##============================================================================= #include <cyg/hal/i386.inc> #include <cyg/hal/variant.inc> ##----------------------------------------------------------------------------- ## CPU specific macros. These provide a common assembler interface to ## operations that may have CPU specific implementations on different ## variants of the architecture. #ifndef CYGPKG_HAL_I386_CPU_INIT_DEFINED # Initialize CPU .macro hal_cpu_init .endm #endif /* !CYGPKG_HAL_I386_CPU_INIT_DEFINED */ ##----------------------------------------------------------------------------- #ifndef CYGPKG_HAL_I386_INTC_DEFINED #ifndef CYGPKG_HAL_I386_INTC_INIT_DEFINED # initialize all interrupts to disabled .macro hal_intc_init .endm #endif .macro hal_intc_decode vnum .endm #endif #------------------------------------------------------------------------------ # SMP support #ifdef CYGPKG_HAL_SMP_SUPPORT .macro hal_smp_init #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS) movl $0,cyg_hal_smp_vsr_sync_flag #endif .endm // Put CPU number in register .macro hal_smp_cpu reg movl cyg_hal_smp_local_apic,\reg movl 0x20(\reg),\reg shrl $24,\reg .endm #else .macro hal_smp_init .endm .macro hal_smp_cpu reg movl $0,\reg .endm #endif #------------------------------------------------------------------------------ # Stack switching macros #ifndef CYG_HAL_I386_INTSTACK_MACROS_DEFINED #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK #ifdef CYGPKG_HAL_SMP_SUPPORT .macro hal_init_istack reg hal_smp_cpu %ebx movl $__interrupt_stack_vector,%ecx movl $CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE,%eax imull %ebx,%eax addl $__interrupt_stack_first,%eax movl %eax,0(%ecx,%ebx,4) movl $CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE,\reg addl %eax,\reg .endm .macro hal_load_istack reg hal_load_istack_base \reg addl $CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE,\reg .endm .macro hal_load_istack_base reg hal_smp_cpu \reg movl $__interrupt_stack_vector,%eax movl 0(%eax,\reg,4),\reg .endm #else // CYGPKG_HAL_SMP_SUPPORT .macro hal_init_istack reg,tr movl $__interrupt_stack,\reg // Load interrupt stack .endm .macro hal_load_istack reg movl $__interrupt_stack,\reg // Load interrupt stack .endm .macro hal_load_istack_base reg movl $__interrupt_stack_base,\reg // Load interrupt stack base .endm #endif // CYGPKG_HAL_SMP_SUPPORT .macro hal_to_intstack hal_load_istack_base %ebx // EBX = stack base movl %ebx,%eax addl $CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE,%eax cmpl %ebx,%ebp # compare SP with istack base jb 1f # if sp < istack base, switch cmpl %eax,%ebp # compare SP with istack top jbe 2f # if sp < istack top, dont switch 1: movl %eax,%esp # move on to new stack 2: pushl %ebp # Save old SP on new stack .endm .macro hal_from_intstack popl %esp # pop old SP from stack .endm #define CYG_HAL_I386_INTSTACK_MACROS_DEFINED #else // CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK .macro hal_init_istack reg .endm .macro hal_load_istack_base reg .endm .macro hal_load_istack reg .endm .macro hal_to_intstack .endm .macro hal_from_intstack .endm #define CYG_HAL_I386_INTSTACK_MACROS_DEFINED #endif // CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK #endif // CYG_HAL_I386_INTSTACK_MACROS_DEFINED #------------------------------------------------------------------------------ # FPU macros. #ifndef CYGPKG_HAL_I386_FPU_DEFINED #ifdef CYGHWR_HAL_I386_FPU #define CYGPKG_HAL_I386_FPU_DEFINED .macro hal_fpu_init # Tell the CPU to use the math hardware. movl %cr0, %eax orl $0x32, %eax # Set MP, ET, NE bits andl $~0x8, %eax # And clear TS bit movl %eax, %cr0 finit # and initialize... ## Enable floating point exceptions. Bit mask: ## 1 - invalid operation ## 2 - denormalized operand ## 4 - zero divide ## 8 - overflow ## 16 - underflow ## 32 - precision pushl $0 # space for CW fstcw 0(%esp) # store FPCW to stack movl 0(%esp),%eax # get into EAX andb $(~0x04),%al # allow only zero divide exceptions movl %eax,0(%esp) # put back into memory fldcw 0(%esp) # reload addl $4,%esp # pop value #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # set CR4.OSFXSR to safely use stmxcsr/ldmxcsr movl %cr4, %eax orl $0x200, %eax movl %eax, %cr4 ## Enable SIMD exceptions. Bit mask: ## 0x0080 - invalid operation ## 0x0100 - denormalized operand ## 0x0200 - zero divide ## 0x0400 - overflow ## 0x0800 - underflow ## 0x1000 - precision pushl $0 # space for MXCSR stmxcsr 0(%esp) # store MXCSR to stack movl 0(%esp),%eax # get into EAX andw $(~0x0200),%ax # allow only zero divide exceptions movl %eax,0(%esp) # put back into memory ldmxcsr 0(%esp) # reload addl $4,%esp # pop value #endif #ifdef CYGHWR_HAL_I386_FPU_SWITCH_LAZY # Tell the CPU to generate an FPU unavailable exception # when the FPU is first used. movl %cr0, %eax orl $0x8, %eax movl %eax, %cr0 # Plant a pointer to the FPU switch VSR into slot 7 # of the VSR table. movl $__fpu_switch_vsr,%eax movl %eax,(hal_vsr_table+7*4) # Now create an FPU context on the stack so that we can take # FPU-using interrupts and exceptions before the machine starts # up. subl $i386reg_fpucontext_size,%esp movl $0,i386reg_fpucontext_valid(%esp) hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table movl %esp,0(%ecx,%ebx,4) # save in table[cpu] entry #endif .endm .macro hal_fpu_cpu_init # Tell the CPU to use the math hardware. movl %cr0, %eax orl $0x32, %eax # Set MP, ET, NE bits andl $~0x8, %eax # And clear TS bit movl %eax, %cr0 finit # and initialize... ## Enable floating point exceptions. Bit mask: ## 1 - invalid operation ## 2 - denormalized operand ## 4 - zero divide ## 8 - overflow ## 16 - underflow ## 32 - precision pushl $0 # space for CW fstcw 0(%esp) # store FPCW to stack movl 0(%esp),%eax # get into EAX andb $(~0x04),%al # allow only zero divide exceptions movl %eax,0(%esp) # put back into memory fldcw 0(%esp) # reload addl $4,%esp # pop value #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # set CR4.OSFXSR to safely use stmxcsr/ldmxcsr movl %cr4, %eax orl $0x200, %eax movl %eax, %cr4 ## Enable SIMD exceptions. Bit mask: ## 0x0080 - invalid operation ## 0x0100 - denormalized operand ## 0x0200 - zero divide ## 0x0400 - overflow ## 0x0800 - underflow ## 0x1000 - precision pushl $0 # space for MXCSR stmxcsr 0(%esp) # store MXCSR to stack movl 0(%esp),%eax # get into EAX andw $(~0x0200),%ax # allow only zero divide exceptions movl %eax,0(%esp) # put back into memory ldmxcsr 0(%esp) # reload addl $4,%esp # pop value #endif #ifdef CYGHWR_HAL_I386_FPU_SWITCH_LAZY # Tell the CPU to generate an FPU unavailable exception # when the FPU is first used. movl %cr0, %eax orl $0x8, %eax movl %eax, %cr0 # Now create an FPU context on the stack so that we can take # FPU-using interrupts and exceptions before the kernel starts # up. subl $i386reg_fpucontext_size,%esp movl $0,i386reg_fpucontext_valid(%esp) hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table movl %esp,0(%ecx,%ebx,4) # save in table[cpu] entry #endif .endm #ifndef CYGHWR_HAL_I386_FPU_SWITCH_LAZY # Non-lazy CPU state switching. We simply switch the entire # FPU state on every context switch, interrupt or exception. # ------------------------------------------------------------ # Context switch handling .macro hal_fpu_push_ctx subl $i386reg_fpstate_size,%esp # make space fnsave i386reg_fpstate(%esp) # save FPU state #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # Save SIMD state. # FIXME. This is awfully inefficient. Need to use FXSAVE to # save FPU and SIMD at same time. FXSAVE requires a 16 byte # alignment and does not have an implicit finit as does FSAVE. stmxcsr i386reg_simd_mxcsr(%esp) movups %xmm0,i386reg_simd_xmm0(%esp) movups %xmm1,i386reg_simd_xmm1(%esp) movups %xmm2,i386reg_simd_xmm2(%esp) movups %xmm3,i386reg_simd_xmm3(%esp) movups %xmm4,i386reg_simd_xmm4(%esp) movups %xmm5,i386reg_simd_xmm5(%esp) movups %xmm6,i386reg_simd_xmm6(%esp) movups %xmm7,i386reg_simd_xmm7(%esp) #endif movl $1,i386reg_fpstate_valid(%esp) # indicate it is valid .endm .macro hal_fpu_pop_ctx btl $0,i386reg_fpstate_valid(%esp) # check ls bit of valid flag jc 1f # if set, restore state finit # otherwise init FPU #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # FIXME. Anything needed here? #endif jmp 2f # and skip restore 1: frstor i386reg_fpstate(%esp) # restore FPU state #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # Restore SIMD state. # FIXME. This is awfully inefficient. Need to use FXRSTOR to # restore FPU and SIMD at same time. FXRSTOR requires a 16 byte # alignment. movups i386reg_simd_xmm0(%esp),%xmm0 movups i386reg_simd_xmm1(%esp),%xmm1 movups i386reg_simd_xmm2(%esp),%xmm2 movups i386reg_simd_xmm3(%esp),%xmm3 movups i386reg_simd_xmm4(%esp),%xmm4 movups i386reg_simd_xmm5(%esp),%xmm5 movups i386reg_simd_xmm6(%esp),%xmm6 movups i386reg_simd_xmm7(%esp),%xmm7 ldmxcsr i386reg_simd_mxcsr(%esp) #endif 2: addl $i386reg_fpstate_size,%esp # pop space used .endm # ------------------------------------------------------------ # Interrupt and exception handling # In this configuration, the interrupt and exception code behaves in # exactly the same way as the context switch code. .macro hal_fpu_push_int hal_fpu_push_ctx .endm .macro hal_fpu_push_int_annex .endm .macro hal_fpu_pop_int_annex .endm .macro hal_fpu_pop_int hal_fpu_pop_ctx .endm .macro hal_fpu_push_exc hal_fpu_push_ctx .endm .macro hal_fpu_push_exc_annex .endm .macro hal_fpu_pop_exc_annex .endm .macro hal_fpu_pop_exc hal_fpu_pop_ctx .endm #else // CYGHWR_HAL_I386_FPU_SWITCH_LAZY # Lazy CPU state switching. We defer CPU state switching until the new # thread actually uses the FPU. This state switch is handled by # __fpu_switch_vsr in vectors.S. .extern cyg_hal_fpustate_owner .extern cyg_hal_fpustate_current # ------------------------------------------------------------ # Context switch handling # On context switch we simply stack a pointer to this # threads FPU context save area. .macro hal_fpu_push_ctx hal_smp_cpu %ebx # Get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table pushl 0(%ecx,%ebx,4) # push table[cpu] entry .endm # We do nothing here but set the CR0:TS bit to force # an exception when the FPU is next used and pop the # FPU save area pointer into the static variable. .macro hal_fpu_pop_ctx movl %cr0, %ecx # get CR0 orl $0x8, %ecx # set TS bit movl %ecx, %cr0 # restore CR0 hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table popl 0(%ecx,%ebx,4) # pop table[cpu] entry .endm # ------------------------------------------------------------ # Interrupt handling # On entry to an interrupt we save the current threads FPU context # pointer and set the CR0:TS bit to trap any FP operations in the # interrupt. .macro hal_fpu_push_int hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table pushl 0(%ecx,%ebx,4) # push table[cpu] entry # ensure that CR0:TS bit is set movl %cr0, %ecx # get CR0 orl $0x8, %ecx # set TS bit movl %ecx, %cr0 # restore CR0 .endm # The following is called after we transfer to the interrupt # stack. We make space here for the FPU state of the interrupt # handler to be saved in case we get nested interrupts that use FP. .macro hal_fpu_push_int_annex subl $i386reg_fpucontext_size,%esp movl $0,i386reg_fpucontext_valid(%esp) hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table movl %esp,0(%ecx,%ebx,4) # save in table[cpu] entry .endm # This is invoked just before any transfer back to the thread stack. # We check whether we are the FPU state owner, and if so, abdicate. # There is no need to save the state, the next thread will load its # own state over the top of it. .macro hal_fpu_pop_int_annex hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_owner,%ecx # current state table cmpl 0(%ecx,%ebx,4),%esp # are we FPU owner? jne 1f # if not, then just continue movl $0,0(%ecx,%ebx,4) # no one owns FPU now # ensure that CR0:TS bit is set to force a reload of # the previous FPU state movl %cr0, %ecx # get CR0 orl $0x8, %ecx # set TS bit movl %ecx, %cr0 # restore CR0 1: addl $i386reg_fpucontext_size,%esp # pop FPU save area .endm # Final return from interrupt handling. Just pull the current # FPU context off the stack. .macro hal_fpu_pop_int hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table popl 0(%ecx,%ebx,4) # pop table[cpu] entry .endm # ------------------------------------------------------------ # Exception handling # Whenever we take an exception, we save the current FPU state away # into its save area. This way, if we are going to end up in GDB, the # whole machine state is saved in memory. .macro hal_fpu_push_exc hal_smp_cpu %ebx # get CPU id movl $cyg_hal_fpustate_current,%ecx # current state table pushl 0(%ecx,%ebx,4) # push table[cpu] entry movl $cyg_hal_fpustate_owner,%ecx # current owner table movl 0(%ecx,%ebx,4),%eax # EAX = FPU state owner cmpl $0,%eax # test it je 1f # skip if zero fnsave i386reg_fpucontext_state(%eax) # save state #ifdef CYGHWR_HAL_I386_PENTIUM_SSE # Save SIMD state. # FIXME. This is awfully inefficient. Need to use FXSAVE to # save FPU and SIMD at same time. FXSAVE requires a 16 byte # alignment and does not have an implicit finit as does FSAVE. stmxcsr i386reg_simd_mxcsr(%eax) movups %xmm0,i386reg_simd_xmm0(%eax) movups %xmm1,i386reg_simd_xmm1(%eax) movups %xmm2,i386reg_simd_xmm2(%eax) movups %xmm3,i386reg_simd_xmm3(%eax) movups %xmm4,i386reg_simd_xmm4(%eax) movups %xmm5,i386reg_simd_xmm5(%eax) movups %xmm6,i386reg_simd_xmm6(%eax) movups %xmm7,i386reg_simd_xmm7(%eax) #endif movl $1,i386reg_fpucontext_valid(%eax) # set valid movl $0,0(%ecx,%ebx,4) # zero owner pointer 1: .endm # The rest of the exception macros behave exactly like the # interrupt ones. .macro hal_fpu_push_exc_annex hal_fpu_push_int_annex .endm .macro hal_fpu_pop_exc_annex hal_fpu_pop_int_annex .endm .macro hal_fpu_pop_exc hal_fpu_pop_int .endm #endif // CYGHWR_HAL_I386_FPU_SWITCH_LAZY #else /* !CYGHWR_HAL_I386_FPU */ # Non-FP macros. .macro hal_fpu_init .endm .macro hal_fpu_cpu_init .endm .macro hal_fpu_push_ctx .endm .macro hal_fpu_pop_ctx .endm .macro hal_fpu_push_int .endm .macro hal_fpu_push_int_annex .endm .macro hal_fpu_pop_int_annex .endm .macro hal_fpu_pop_int .endm .macro hal_fpu_push_exc .endm .macro hal_fpu_push_exc_annex .endm .macro hal_fpu_pop_exc_annex .endm .macro hal_fpu_pop_exc .endm #endif #endif #------------------------------------------------------------------------------ # MMU macros. #ifndef CYGPKG_HAL_I386_MMU_DEFINED #define CYGPKG_HAL_I386_MMU_DEFINED .macro hal_mmu_init .endm #endif #------------------------------------------------------------------------------ # A20 gate enable #define K_RDWR 0x60 #define K_STATUS 0x64 #define K_CMD 0x64 #define K_OBUF_FUL 0x01 #define K_IBUF_FUL 0x02 #define KC_CMD_WIN 0xD0 #define KC_CMD_WOUT 0xD1 #define KB_A20 0xDF .macro hal_a20_enable // Enable A20 so that addresses at 1MB don't wrap around back to 0. 1: inb $K_STATUS, %al testb $K_IBUF_FUL, %al jnz 1b 2: inb $K_STATUS, %al testb $K_OBUF_FUL, %al jz 3f inb $K_RDWR, %al jmp 2b 3: movb $KC_CMD_WOUT, %al outb %al, $K_CMD 1: inb $K_STATUS, %al testb $K_IBUF_FUL, %al jnz 1b movb $KB_A20, %al outb %al, $K_RDWR 1: inb $K_STATUS, %al testb $K_IBUF_FUL, %al jnz 1b .endm #------------------------------------------------------------------------------ # MEMC macros. # This version simply enables the A20 gate. #ifndef CYGPKG_HAL_I386_MEMC_DEFINED .macro hal_memc_init hal_a20_enable .endm #endif #------------------------------------------------------------------------------ # Cache macros. #ifndef CYGPKG_HAL_I386_CACHE_DEFINED .macro hal_cache_init .endm #endif #------------------------------------------------------------------------------ # Diagnostics macros. #ifndef CYGPKG_HAL_I386_DIAG_DEFINED .macro hal_diag_init .endm .macro hal_diag_excpt_start .endm .macro hal_diag_intr_start .endm .macro hal_diag_restore .endm #endif #------------------------------------------------------------------------------ # Timer initialization. #ifndef CYGPKG_HAL_I386_TIMER_DEFINED .macro hal_timer_init .endm #endif #------------------------------------------------------------------------------ # Monitor initialization. #ifndef CYGPKG_HAL_I386_MON_DEFINED .macro hal_mon_init .endm #endif #------------------------------------------------------------------------------ #endif // ifndef CYGONCE_HAL_ARCH_INC # end of arch.inc
