path: root/arch/sparc/kernel/head.S

/* $Id: head.S,v 1.105 2001/08/12 09:08:56 davem Exp $
 * head.S: The initial boot code for the Sparc port of Linux.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1995,1999 Pete Zaitcev   (zaitcev@yahoo.com)
 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
 * Copyright (C) 1997 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
 *
 * CompactPCI platform by Eric Brower, 1999.
 */

#include <linux/version.h>
#include <linux/config.h>
#include <linux/init.h>

#include <asm/head.h>
#include <asm/asi.h>
#include <asm/contregs.h>
#include <asm/ptrace.h>
#include <asm/psr.h>
#include <asm/page.h>
#include <asm/kdebug.h>
#include <asm/winmacro.h>
#include <asm/thread_info.h>	/* TI_UWINMASK */
#include <asm/errno.h>
#include <asm/pgtsrmmu.h>	/* SRMMU_PGDIR_SHIFT */

	.data
/* 
 * The following are used with the prom_vector node-ops to figure out
 * the cpu-type 
 */

	.align 4
        .globl  cputyp
cputyp:
        .word   1

	.align 4
	.globl cputypval
cputypval:
	.asciz "sun4c"
	.ascii "     "

cputypvalend:
cputypvallen = cputypvar - cputypval

	.align 4
/*
 * Sun people can't spell worth damn. "compatability" indeed.
 * At least we *know* we can't spell, and use a spell-checker.
 */

/* Uh, actually Linus it is I who cannot spell. Too much murky
 * Sparc assembly will do this to ya.
 */
cputypvar:
	.asciz "compatability"

/* Tested on SS-5, SS-10. Probably someone at Sun applied a spell-checker. */
	.align 4
cputypvar_sun4m:
	.asciz "compatible"

	.align 4

#ifndef CONFIG_SUN4
sun4_notsup:
	.asciz	"Sparc-Linux sun4 needs a specially compiled kernel, turn CONFIG_SUN4 on.\n\n"
	.align 4
#else
sun4cdm_notsup:
	.asciz	"Kernel compiled with CONFIG_SUN4 cannot run on SUN4C/SUN4M/SUN4D\nTurn CONFIG_SUN4 off.\n\n"
	.align 4
#endif

sun4e_notsup:
        .asciz  "Sparc-Linux sun4e support does not exist\n\n"
	.align 4

#ifndef CONFIG_SUNOS_EMUL
#undef SUNOS_SYSCALL_TRAP
#define SUNOS_SYSCALL_TRAP SUNOS_NO_SYSCALL_TRAP
#endif

	/* The Sparc trap table, bootloader gives us control at _start. */
	.text
	.globl	start, _stext, _start, __stext
	.globl  trapbase
_start:   /* danger danger */
__stext:
_stext:
start:
trapbase:
#ifdef CONFIG_SMP
trapbase_cpu0:
#endif
/* We get control passed to us here at t_zero. */
t_zero:	b gokernel; nop; nop; nop;
t_tflt:	SPARC_TFAULT                        /* Inst. Access Exception        */
t_bins:	TRAP_ENTRY(0x2, bad_instruction)    /* Illegal Instruction           */
t_pins:	TRAP_ENTRY(0x3, priv_instruction)   /* Privileged Instruction        */
t_fpd:	TRAP_ENTRY(0x4, fpd_trap_handler)   /* Floating Point Disabled       */
t_wovf:	WINDOW_SPILL                        /* Window Overflow               */
t_wunf:	WINDOW_FILL                         /* Window Underflow              */
t_mna:	TRAP_ENTRY(0x7, mna_handler)        /* Memory Address Not Aligned    */
t_fpe:	TRAP_ENTRY(0x8, fpe_trap_handler)   /* Floating Point Exception      */
t_dflt:	SPARC_DFAULT                        /* Data Miss Exception           */
t_tio:	TRAP_ENTRY(0xa, do_tag_overflow)    /* Tagged Instruction Ovrflw     */
t_wpt:	TRAP_ENTRY(0xb, do_watchpoint)      /* Watchpoint Detected           */
t_badc:	BAD_TRAP(0xc) BAD_TRAP(0xd) BAD_TRAP(0xe) BAD_TRAP(0xf) BAD_TRAP(0x10)
t_irq1:	TRAP_ENTRY_INTERRUPT(1)             /* IRQ Software/SBUS Level 1     */
t_irq2:	TRAP_ENTRY_INTERRUPT(2)             /* IRQ SBUS Level 2              */
t_irq3:	TRAP_ENTRY_INTERRUPT(3)             /* IRQ SCSI/DMA/SBUS Level 3     */
t_irq4:	TRAP_ENTRY_INTERRUPT(4)             /* IRQ Software Level 4          */
t_irq5:	TRAP_ENTRY_INTERRUPT(5)             /* IRQ SBUS/Ethernet Level 5     */
t_irq6:	TRAP_ENTRY_INTERRUPT(6)             /* IRQ Software Level 6          */
t_irq7:	TRAP_ENTRY_INTERRUPT(7)             /* IRQ Video/SBUS Level 5        */
t_irq8:	TRAP_ENTRY_INTERRUPT(8)             /* IRQ SBUS Level 6              */
t_irq9:	TRAP_ENTRY_INTERRUPT(9)             /* IRQ SBUS Level 7              */
t_irq10:TRAP_ENTRY_INTERRUPT(10)            /* IRQ Timer #1 (one we use)     */
t_irq11:TRAP_ENTRY_INTERRUPT(11)            /* IRQ Floppy Intr.              */
t_irq12:TRAP_ENTRY_INTERRUPT(12)            /* IRQ Zilog serial chip         */
t_irq13:TRAP_ENTRY_INTERRUPT(13)            /* IRQ Audio Intr.               */
t_irq14:TRAP_ENTRY_INTERRUPT(14)            /* IRQ Timer #2                  */
	.globl	t_nmi
#ifndef CONFIG_SMP
t_nmi:	NMI_TRAP                            /* Level 15 (NMI)                */
#else
t_nmi:	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
#endif
t_racc:	TRAP_ENTRY(0x20, do_reg_access)     /* General Register Access Error */
t_iacce:BAD_TRAP(0x21)                      /* Instr Access Error            */
t_bad22:BAD_TRAP(0x22) BAD_TRAP(0x23)
t_cpdis:TRAP_ENTRY(0x24, do_cp_disabled)    /* Co-Processor Disabled         */
t_uflsh:SKIP_TRAP(0x25, unimp_flush)        /* Unimplemented FLUSH inst.     */
t_bad26:BAD_TRAP(0x26) BAD_TRAP(0x27)
t_cpexc:TRAP_ENTRY(0x28, do_cp_exception)   /* Co-Processor Exception        */
t_dacce:SPARC_DFAULT                        /* Data Access Error             */
t_hwdz:	TRAP_ENTRY(0x2a, do_hw_divzero)     /* Division by zero, you lose... */
t_dserr:BAD_TRAP(0x2b)                      /* Data Store Error              */
t_daccm:BAD_TRAP(0x2c)                      /* Data Access MMU-Miss          */
t_bad2d:BAD_TRAP(0x2d) BAD_TRAP(0x2e) BAD_TRAP(0x2f) BAD_TRAP(0x30) BAD_TRAP(0x31)
t_bad32:BAD_TRAP(0x32) BAD_TRAP(0x33) BAD_TRAP(0x34) BAD_TRAP(0x35) BAD_TRAP