vectors.s

来自「eCos操作系统源码」· S 代码 · 共 643 行 · 第 1/2 页

#ifdef CYGFUN_HAL_COMMON_KERNEL_SUPPORT
#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK
##-----------------------------------------------------------------------------
## Execute pending DSRs on the interrupt stack with interrupts enabled.
## Note: this can only be called from code running on a thread stack
FUNC_START(hal_interrupt_stack_call_pending_DSRs)
        # Change to interrupt stack
        mov     r15,r2
        mov.l   $cyg_interrupt_stack,r15

        mov.l   r2,@-r15                ! save old stack pointer
        sts.l   pr,@-r15                ! save pr on stack
        stc     sr,r3
        mov.l   r3,@-r15                ! save sr on stack

        # enable interrupts
        hal_cpu_int_enable r0,r1

        # Call into kernel which will execute DSRs
        mov.l   $cyg_interrupt_call_pending_DSRs,r0
        jsr     @r0
         nop

        # Get old sr, pr, and stack values
        mov.l   @r15+,r3                ! get old sr
        lds.l   @r15+,pr                ! get old pr
        mov.l   @r15+,r15               ! get old stack pointer

        # Restore SR interrupt state
        hal_cpu_int_merge r3,r0,r1
        rts
         nop

#endif // CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK
#endif // CYGFUN_HAL_COMMON_KERNEL_SUPPORT

        .align  2        

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) \
    || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
        SYM_PTR_REF(hal_saved_interrupt_state)
#endif

#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK 
        SYM_PTR_REF(cyg_interrupt_stack_base)
        SYM_PTR_REF(cyg_interrupt_stack)
#endif
        SYM_PTR_REF(hal_interrupt_handlers)
        SYM_PTR_REF(hal_interrupt_data)
        SYM_PTR_REF(hal_interrupt_objects)

#ifdef CYGSEM_HAL_COMMON_INTERRUPTS_ALLOW_NESTING
        SYM_PTR_REF(cyg_hal_ILVL_table)
$unmasked_SR:
        .long   (CYG_SR & ~CYGARC_REG_SR_IMASK)
#endif // CYGSEM_HAL_COMMON_INTERRUPTS_ALLOW_NESTING
        
        
#ifdef CYGFUN_HAL_COMMON_KERNEL_SUPPORT
        SYM_PTR_REF(cyg_interrupt_call_pending_DSRs)
        SYM_PTR_REF(interrupt_end)
        SYM_PTR_REF(cyg_scheduler_sched_lock)
#endif

#---------------------------------------------------------------------------
# Platform initialization (reset)
FUNC_START(_reset_platform)
        hal_post_reset_init     

#ifdef __DEBUG
        mov     #0,r0
        mov     #1,r1
        mov     #2,r2
        mov     #3,r3
        mov     #4,r4
        mov     #5,r5
        mov     #6,r6
        mov     #7,r7
        mov     #8,r8
        mov     #9,r9
        mov     #10,r10
        mov     #11,r11
        mov     #12,r12
        mov     #13,r13
        mov     #14,r14
#endif
       
        # Call platform specific hardware initialization
        # This may include memory controller initialization. It is not
        # safe to access RAM until after this point.
        # Note that caches must not be enabled until after this point,
        # since we may be fiddling the FRQCR which cannot be safely done
        # by code in burst/cachable memory (errata SH7-184e).
        hal_hardware_init

        # Now copy necessary bits to RAM and jump to the VMA base

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_SUBSETROMRAM)

        # Copy data from ROM to ram
        mov.l   $_rom_data_start,r3    ! r3 = rom start
        mov.l   $_ram_data_start,r4    ! r4 = ram start
        mov.l   $_ram_data_end,r5      ! r5 = ram end
        
        cmp/eq  r4,r5                   ! skip if no data
        bt      2f
1:      mov.l   @r3+,r0                 ! get word from ROM
        mov.l   r0,@r4                  ! store in RAM
        add     #4,r4
        cmp/eq  r4,r5                   ! compare
        bf      1b                      ! loop if not yet done
2:


        # Jump to the proper VMA base of the code.
        mov.l   $complete_setup,r0
        jmp     @r0
         nop
        .align 2

        SYM_PTR_REF(_rom_data_start)
        SYM_PTR_REF(_ram_data_start)
        SYM_PTR_REF(_ram_data_end)
        SYM_PTR_REF(complete_setup)


#elif defined(CYG_HAL_STARTUP_ROMRAM)

        # Copy everything to the proper VMA base and jump to it.
        mov.l   $_vector_code_lma,r0
        mov.l   $_vector_code_vma,r1
        mov.l   $end,r2
1:      mov.l   @r0+,r3                 ! get word from ROM
        mov.l   r3,@r1                  ! store in RAM
        add     #4,r1
        cmp/eq  r1,r2                   ! compare
        bf      1b                      ! loop if not yet done
        mov.l   $complete_setup,r0
        jmp     @r0
         nop
        .align  2

        SYM_PTR_REF(_vector_code_lma)
        SYM_PTR_REF(_vector_code_vma)
        SYM_PTR_REF(end)
        SYM_PTR_REF(complete_setup)

#else

        # Jump to remaining setup code. Relative branch is OK since VMA=LMA.
        bra   CYG_LABEL_DEFN(complete_setup)
         nop
                
#endif

#-----------------------------------------------------------------------------
# Complete target initialization and setup.
# After this point we can use absolute addressing modes and access all the
# memory in the system.

	.align  2
FUNC_START(complete_setup)
                
        # Set up monitor related stuff (vectors primarily)
        hal_mon_init

        # set up stack
        mov.l    $startup_stack,r15

        # clear BSS
        mov.l   $_bss_start,r3         ! r3 = start
        mov.l   $_bss_end,r4           ! r4 = end
        mov     #0,r0                   ! r0 = 0
1:      cmp/eq  r3,r4                   ! skip if no bss
        bt      2f
        mov.l   r0,@r3                  ! store zero
        add     #4,r3
        bra     1b                      ! loop
         nop
2:

        # It is now safe to call C functions which may rely on initialized
        # data.
        
#        # Initialize MMU.
#        .extern hal_MMU_init
#        jsr      hal_MMU_init
#         nop
        
        # Enable caches
        mov.l    $cyg_var_enable_caches,r1
        jsr      @r1
         nop

        # Variant HALs may need to do something special before we continue
        mov.l    $hal_variant_init,r1
        jsr      @r1
         nop

        # Platform initialization
        mov.l    $hal_platform_init,r1
        jsr      @r1
         nop
        
        # call c++ constructors
        mov.l    $cyg_hal_invoke_constructors,r1
        jsr      @r1
         nop

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        mov.l    $initialize_stub,r1
        jsr      @r1
         nop
#endif
#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) \
    || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
        mov.l    $hal_ctrlc_isr_init,r1
        jsr      @r1
         nop
#endif

        mov.l    $cyg_start,r1
        jsr      @r1
         nop
9:      
        bra      9b                     ! if we return, loop
         nop

        .align  2
        SYM_PTR_REF(_bss_start)
        SYM_PTR_REF(_bss_end)
        SYM_PTR_REF(startup_stack)
        SYM_PTR_REF(cyg_hal_invoke_constructors)
        SYM_PTR_REF(cyg_var_enable_caches)
        SYM_PTR_REF(hal_variant_init)
        SYM_PTR_REF(hal_platform_init)
        SYM_PTR_REF(cyg_start)

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        SYM_PTR_REF(initialize_stub)
#endif
#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) \
    || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
        SYM_PTR_REF(hal_ctrlc_isr_init)
#endif

#---------------------------------------------------------------------------
# Interrupt vector tables.
# These tables contain the isr, data and object pointers used to deliver
# interrupts to user code.

        .data

        .extern CYG_LABEL_DEFN(hal_default_isr)
#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
#define CYG_ISR_TABLE_SIZE    1
#else
#define CYG_ISR_TABLE_SIZE    CYGNUM_HAL_ISR_COUNT
#endif

SYM_DEF(hal_interrupt_handlers)
        .rept   CYG_ISR_TABLE_SIZE
        .long   CYG_LABEL_DEFN(hal_default_isr)
        .endr

SYM_DEF(hal_interrupt_data)
        .rept   CYG_ISR_TABLE_SIZE
        .long   0
        .endr

SYM_DEF(hal_interrupt_objects)
        .rept   CYG_ISR_TABLE_SIZE
        .long   0
        .endr

#---------------------------------------------------------------------------
## Temporary interrupt stack
        
        .section ".bss"

#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK 
        .balign 16
SYM_DEF(cyg_interrupt_stack_base)
        .rept CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE
        .byte 0
        .endr
        .balign 16
        .global _cyg_interrupt_stack
SYM_DEF(cyg_interrupt_stack)
        
        .long   0,0,0,0
#endif // CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK


#if defined(CYGSEM_HAL_ROM_MONITOR) || defined(CYGPKG_REDBOOT)
  // Enough space for stub to handle downloads. If using thread capabilities
  // it will be using the RAM application's stack.
# define STARTUP_STACK_SIZE CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE
#else
# ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK
   // Enough space to run constructors.
   // FIXME: 512 is enough for all tests. doc/examples/twothreads
   // calls printf on this stack though, and so requires more space.
#  define STARTUP_STACK_SIZE 1024
# else
#  define STARTUP_STACK_SIZE CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE
# endif
#endif

        .balign 16
SYM_DEF(startup_stack_base)
        .rept   STARTUP_STACK_SIZE
        .byte 0
        .endr
        .balign 16
SYM_DEF(startup_stack)
        .long   0,0,0,0

#---------------------------------------------------------------------------
# end of vectors.S