| /* $Id: trampoline.S,v 1.14 2002/01/11 08:45:38 davem Exp $ |
| * 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 <linux/init.h> |
| #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, __smp4m_processor_id |
| .globl sun4d_cpu_startup, __smp4d_processor_id |
| |
| __INIT |
| .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 smp4m_callin |
| nop |
| |
| b,a smp_do_cpu_idle |
| |
| .text |
| .align 4 |
| |
| smp_do_cpu_idle: |
| call cpu_idle |
| mov 0, %o0 |
| |
| call cpu_panic |
| nop |
| |
| __smp4m_processor_id: |
| rd %tbr, %g2 |
| srl %g2, 12, %g2 |
| and %g2, 3, %g2 |
| retl |
| mov %g1, %o7 |
| |
| __smp4d_processor_id: |
| lda [%g0] ASI_M_VIKING_TMP1, %g2 |
| retl |
| mov %g1, %o7 |
| |
| /* CPUID in bootbus can be found at PA 0xff0140000 */ |
| #define SUN4D_BOOTBUS_CPUID 0xf0140000 |
| |
| __INIT |
| .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 smp4d_callin |
| nop |
| |
| b,a smp_do_cpu_idle |
