Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* $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