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Rev 3022 Rev 4055
Line 29... Line 29...
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#include <arch/asm/regname.h>
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#include <arch/asm/regname.h>
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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <arch/asm/boot.h>
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#include <arch/asm/boot.h>
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#include <arch/context_offset.h>
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#include <arch/context_offset.h>
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#include <arch/stack.h>
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#include <arch/stack.h>
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.text
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.text
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.set noat
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.set noat
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.set noreorder
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.set noreorder
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.set nomacro
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.set nomacro
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	mflo $at
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	mflo $at
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	sw $at, EOFFSET_LO(\r)
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	sw $at, EOFFSET_LO(\r)
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	mfhi $at
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	mfhi $at
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	sw $at, EOFFSET_HI(\r)
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	sw $at, EOFFSET_HI(\r)
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#ifdef CONFIG_DEBUG_ALLREGS
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	sw $s0, EOFFSET_S0(\r)
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	sw $s1, EOFFSET_S1(\r)
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	sw $s2, EOFFSET_S2(\r)
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	sw $s3, EOFFSET_S3(\r)
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	sw $s4, EOFFSET_S4(\r)
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	sw $s5, EOFFSET_S5(\r)
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	sw $s6, EOFFSET_S6(\r)
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	sw $s7, EOFFSET_S7(\r)
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	sw $s8, EOFFSET_S8(\r)
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#endif
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- 
 
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	sw $gp, EOFFSET_GP(\r)
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	sw $gp, EOFFSET_GP(\r)
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	sw $ra, EOFFSET_RA(\r)
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	sw $ra, EOFFSET_RA(\r)
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	sw $k1, EOFFSET_K1(\r)
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	sw $k1, EOFFSET_K1(\r)
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	mfc0 $t0, $status
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	mfc0 $t0, $status
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	lw $t6, EOFFSET_T6(\r)
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	lw $t6, EOFFSET_T6(\r)
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	lw $t7, EOFFSET_T7(\r)
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	lw $t7, EOFFSET_T7(\r)
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	lw $t8, EOFFSET_T8(\r)
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	lw $t8, EOFFSET_T8(\r)
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	lw $t9, EOFFSET_T9(\r)
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	lw $t9, EOFFSET_T9(\r)
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#ifdef CONFIG_DEBUG_ALLREGS
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	lw $s0, EOFFSET_S0(\r)
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	lw $s1, EOFFSET_S1(\r)
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	lw $s2, EOFFSET_S2(\r)
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	lw $s3, EOFFSET_S3(\r)
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	lw $s4, EOFFSET_S4(\r)
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	lw $s5, EOFFSET_S5(\r)
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	lw $s6, EOFFSET_S6(\r)
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	lw $s7, EOFFSET_S7(\r)
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	lw $s8, EOFFSET_S8(\r)
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#endif
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	lw $gp, EOFFSET_GP(\r)
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	lw $gp, EOFFSET_GP(\r)
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	lw $ra, EOFFSET_RA(\r)
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	lw $ra, EOFFSET_RA(\r)
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	lw $k1, EOFFSET_K1(\r)
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	lw $k1, EOFFSET_K1(\r)
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	lw $at, EOFFSET_LO(\r)
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	lw $at, EOFFSET_LO(\r)
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	# Move $k0 pointer to kernel stack
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	# Move $k0 pointer to kernel stack
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	lui $k0, %hi(supervisor_sp)
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	lui $k0, %hi(supervisor_sp)
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	ori $k0, $k0, %lo(supervisor_sp)
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	ori $k0, $k0, %lo(supervisor_sp)
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	# Move $k0 (superveisor_sp)
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	# Move $k0 (superveisor_sp)
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	lw $k0, 0($k0)
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	lw $k0, 0($k0)
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1:
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1:
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.endm
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.endm
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.org 0x0
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.org 0x0
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kernel_image_start:
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kernel_image_start:
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	/* Load temporary stack */
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	/* Load temporary stack */
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	lui $sp, %hi(end_stack)
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	lui $sp, %hi(end_stack)
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	ori $sp, $sp, %lo(end_stack)
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	ori $sp, $sp, %lo(end_stack)
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	/* $a1 contains physical address of bootinfo_t */
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	/* $a2 contains size of bootinfo_t */
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	/* Not sure about this, but might
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	beq $a2, $0, bootinfo_end
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	/* Not sure about this, but might be needed for PIC code???? */
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	   be needed for PIC code */
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	lui $gp, 0x8000
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	lui $gp, 0x8000
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	lui $a3, %hi(bootinfo)
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	ori $a3, $a3, %lo(bootinfo)
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	/* $a1 contains physical address of bootinfo_t */
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- 
 
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	bootinfo_loop:
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- 
 
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		lw $v0, 0($a1)
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		sw $v0, 0($a3)
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		addi $a1, $a1, 4
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		addi $a3, $a3, 4
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		addi $a2, $a2, -4
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		bgtz $a2, bootinfo_loop
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		nop
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- 
 
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	bootinfo_end:
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	jal arch_pre_main
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	jal arch_pre_main
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	nop
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	nop
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	j main_bsp
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	j main_bsp
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	j cache_error_handler
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	j cache_error_handler
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	nop
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	nop
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exception_entry:
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exception_entry:
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	j exception_handler
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	j exception_handler
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	nop
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	nop
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exception_handler:
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exception_handler:
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	KERNEL_STACK_TO_K0
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	KERNEL_STACK_TO_K0
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	sub $k0, REGISTER_SPACE
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	sub $k0, REGISTER_SPACE
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	sw $sp, EOFFSET_SP($k0)
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	sw $sp, EOFFSET_SP($k0)
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	move $sp, $k0
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	move $sp, $k0
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	mfc0 $k0, $cause
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	mfc0 $k0, $cause
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	sra $k0, $k0, 0x2		# cp0_exc_cause() part 1
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	sra $k0, $k0, 0x2    # cp0_exc_cause() part 1
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	andi $k0, $k0, 0x1f		# cp0_exc_cause() part 2
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	andi $k0, $k0, 0x1f  # cp0_exc_cause() part 2
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	sub $k0, 8			# 8 = SYSCALL
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	sub $k0, 8           # 8 = SYSCALL
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	beqz $k0, syscall_shortcut
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	beqz $k0, syscall_shortcut
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	add $k0, 8			# Revert $k0 back to correct exc number
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	add $k0, 8           # Revert $k0 back to correct exc number
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	REGISTERS_STORE_AND_EXC_RESET $sp
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	REGISTERS_STORE_AND_EXC_RESET $sp
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	move $a1, $sp
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	move $a1, $sp
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	jal exc_dispatch		# exc_dispatch(excno, register_space)
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	jal exc_dispatch     # exc_dispatch(excno, register_space)
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	move $a0, $k0
 210 
	move $a0, $k0
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 211 
 
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	REGISTERS_LOAD $sp
 212 
	REGISTERS_LOAD $sp
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	# The $sp is automatically restored to former value
 213 
	# The $sp is automatically restored to former value
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	eret
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	eret
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	eret
 305 
	eret
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 306 
 
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userspace_asm:
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userspace_asm:
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	add $sp, $a0, 0
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	add $sp, $a0, 0
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	add $v0, $a1, 0
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	add $v0, $a1, 0
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	add $t9, $a2, 0			# Set up correct entry into PIC code
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	add $t9, $a2, 0			# Set up correct entry into PIC code
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	xor $a0, $a0, $a0		# $a0 is defined to hold pcb_ptr
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					# set it to 0
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	eret
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	eret