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Diffstat (limited to 'arch/sparc/kernel/trampoline_32.S')
| -rw-r--r-- | arch/sparc/kernel/trampoline_32.S | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/sparc/kernel/trampoline_32.S b/arch/sparc/kernel/trampoline_32.S new file mode 100644 index 000000000..82fafeeb3 --- /dev/null +++ b/arch/sparc/kernel/trampoline_32.S @@ -0,0 +1,201 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * trampoline.S: SMP cpu boot-up trampoline code. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <asm/head.h> +#include <asm/psr.h> +#include <asm/page.h> +#include <asm/asi.h> +#include <asm/ptrace.h> +#include <asm/vaddrs.h> +#include <asm/contregs.h> +#include <asm/thread_info.h> + + .globl sun4m_cpu_startup + .globl sun4d_cpu_startup + + .align 4 + +/* When we start up a cpu for the first time it enters this routine. + * This initializes the chip from whatever state the prom left it + * in and sets PIL in %psr to 15, no irqs. + */ + +sun4m_cpu_startup: +cpu1_startup: + sethi %hi(trapbase_cpu1), %g3 + b 1f + or %g3, %lo(trapbase_cpu1), %g3 + +cpu2_startup: + sethi %hi(trapbase_cpu2), %g3 + b 1f + or %g3, %lo(trapbase_cpu2), %g3 + +cpu3_startup: + sethi %hi(trapbase_cpu3), %g3 + b 1f + or %g3, %lo(trapbase_cpu3), %g3 + +1: + /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */ + set (PSR_PIL | PSR_S | PSR_PS), %g1 + wr %g1, 0x0, %psr ! traps off though + WRITE_PAUSE + + /* Our %wim is one behind CWP */ + mov 2, %g1 + wr %g1, 0x0, %wim + WRITE_PAUSE + + /* This identifies "this cpu". */ + wr %g3, 0x0, %tbr + WRITE_PAUSE + + /* Give ourselves a stack and curptr. */ + set current_set, %g5 + srl %g3, 10, %g4 + and %g4, 0xc, %g4 + ld [%g5 + %g4], %g6 + + sethi %hi(THREAD_SIZE - STACKFRAME_SZ), %sp + or %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp + add %g6, %sp, %sp + + /* Turn on traps (PSR_ET). */ + rd %psr, %g1 + wr %g1, PSR_ET, %psr ! traps on + WRITE_PAUSE + + /* Init our caches, etc. */ + set poke_srmmu, %g5 + ld [%g5], %g5 + call %g5 + nop + + /* Start this processor. */ + call smp_callin + nop + + b,a smp_panic + + .text + .align 4 + +smp_panic: + call cpu_panic + nop + +/* CPUID in bootbus can be found at PA 0xff0140000 */ +#define SUN4D_BOOTBUS_CPUID 0xf0140000 + + .align 4 + +sun4d_cpu_startup: + /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */ + set (PSR_PIL | PSR_S | PSR_PS), %g1 + wr %g1, 0x0, %psr ! traps off though + WRITE_PAUSE + + /* Our %wim is one behind CWP */ + mov 2, %g1 + wr %g1, 0x0, %wim + WRITE_PAUSE + + /* Set tbr - we use just one trap table. */ + set trapbase, %g1 + wr %g1, 0x0, %tbr + WRITE_PAUSE + + /* Get our CPU id out of bootbus */ + set SUN4D_BOOTBUS_CPUID, %g3 + lduba [%g3] ASI_M_CTL, %g3 + and %g3, 0xf8, %g3 + srl %g3, 3, %g1 + sta %g1, [%g0] ASI_M_VIKING_TMP1 + + /* Give ourselves a stack and curptr. */ + set current_set, %g5 + srl %g3, 1, %g4 + ld [%g5 + %g4], %g6 + + sethi %hi(THREAD_SIZE - STACKFRAME_SZ), %sp + or %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp + add %g6, %sp, %sp + + /* Turn on traps (PSR_ET). */ + rd %psr, %g1 + wr %g1, PSR_ET, %psr ! traps on + WRITE_PAUSE + + /* Init our caches, etc. */ + set poke_srmmu, %g5 + ld [%g5], %g5 + call %g5 + nop + + /* Start this processor. */ + call smp_callin + nop + + b,a smp_panic + + .align 4 + .global leon_smp_cpu_startup, smp_penguin_ctable + +leon_smp_cpu_startup: + + set smp_penguin_ctable,%g1 + ld [%g1+4],%g1 + srl %g1,4,%g1 + set 0x00000100,%g5 /* SRMMU_CTXTBL_PTR */ + sta %g1, [%g5] ASI_LEON_MMUREGS + + /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */ + set (PSR_PIL | PSR_S | PSR_PS), %g1 + wr %g1, 0x0, %psr ! traps off though + WRITE_PAUSE + + /* Our %wim is one behind CWP */ + mov 2, %g1 + wr %g1, 0x0, %wim + WRITE_PAUSE + + /* Set tbr - we use just one trap table. */ + set trapbase, %g1 + wr %g1, 0x0, %tbr + WRITE_PAUSE + + /* Get our CPU id */ + rd %asr17,%g3 + + /* Give ourselves a stack and curptr. */ + set current_set, %g5 + srl %g3, 28, %g4 + sll %g4, 2, %g4 + ld [%g5 + %g4], %g6 + + sethi %hi(THREAD_SIZE - STACKFRAME_SZ), %sp + or %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp + add %g6, %sp, %sp + + /* Turn on traps (PSR_ET). */ + rd %psr, %g1 + wr %g1, PSR_ET, %psr ! traps on + WRITE_PAUSE + + /* Init our caches, etc. */ + set poke_srmmu, %g5 + ld [%g5], %g5 + call %g5 + nop + + /* Start this processor. */ + call smp_callin + nop + + b,a smp_panic |