trampoline.s

优龙2410linux2.6.8内核源代码

/* $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 ([e-mail])
 * Copyright (C) 1998 Jakub Jelinek ([e-mail])
 */

#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