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124 lines
1.8 KiB
124 lines
1.8 KiB
20 years ago
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/*
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* arch/alpha/boot/head.S
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*
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* initial bootloader stuff..
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*/
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#include <asm/system.h>
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.set noreorder
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.globl __start
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.ent __start
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__start:
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br $29,2f
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2: ldgp $29,0($29)
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jsr $26,start_kernel
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call_pal PAL_halt
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.end __start
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.align 5
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.globl wrent
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.ent wrent
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wrent:
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.prologue 0
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call_pal PAL_wrent
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ret ($26)
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.end wrent
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.align 5
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.globl wrkgp
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.ent wrkgp
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wrkgp:
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.prologue 0
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call_pal PAL_wrkgp
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ret ($26)
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.end wrkgp
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.align 5
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.globl switch_to_osf_pal
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.ent switch_to_osf_pal
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switch_to_osf_pal:
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subq $30,128,$30
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.frame $30,128,$26
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stq $26,0($30)
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stq $1,8($30)
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stq $2,16($30)
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stq $3,24($30)
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stq $4,32($30)
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stq $5,40($30)
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stq $6,48($30)
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stq $7,56($30)
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stq $8,64($30)
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stq $9,72($30)
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stq $10,80($30)
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stq $11,88($30)
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stq $12,96($30)
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stq $13,104($30)
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stq $14,112($30)
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stq $15,120($30)
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.prologue 0
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stq $30,0($17) /* save KSP in PCB */
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bis $30,$30,$20 /* a4 = KSP */
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br $17,1f
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ldq $26,0($30)
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ldq $1,8($30)
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ldq $2,16($30)
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ldq $3,24($30)
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ldq $4,32($30)
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ldq $5,40($30)
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ldq $6,48($30)
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ldq $7,56($30)
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ldq $8,64($30)
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ldq $9,72($30)
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ldq $10,80($30)
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ldq $11,88($30)
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ldq $12,96($30)
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ldq $13,104($30)
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ldq $14,112($30)
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ldq $15,120($30)
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addq $30,128,$30
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ret ($26)
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1: call_pal PAL_swppal
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.end switch_to_osf_pal
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.align 3
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.globl tbi
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.ent tbi
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tbi:
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.prologue 0
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call_pal PAL_tbi
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ret ($26)
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.end tbi
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.align 3
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.globl halt
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.ent halt
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halt:
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.prologue 0
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call_pal PAL_halt
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.end halt
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/* $16 - new stack page */
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.align 3
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.globl move_stack
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.ent move_stack
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move_stack:
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.prologue 0
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lda $0, 0x1fff($31)
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and $0, $30, $1 /* Stack offset */
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or $1, $16, $16 /* New stack pointer */
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mov $30, $1
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mov $16, $2
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1: ldq $3, 0($1) /* Move the stack */
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addq $1, 8, $1
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stq $3, 0($2)
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and $0, $1, $4
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addq $2, 8, $2
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bne $4, 1b
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mov $16, $30
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ret ($26)
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.end move_stack
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