1 /* $Id: trampoline.S,v 1.14 2002/01/11 08:45:38 davem Exp $
2 * trampoline.S: SMP cpu boot-up trampoline code.
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 #include <linux/init.h>
13 #include <asm/ptrace.h>
14 #include <asm/vaddrs.h>
15 #include <asm/contregs.h>
16 #include <asm/thread_info.h>
18 .globl sun4m_cpu_startup, __smp4m_processor_id
19 .globl sun4d_cpu_startup, __smp4d_processor_id
24 /* When we start up a cpu for the first time it enters this routine.
25 * This initializes the chip from whatever state the prom left it
26 * in and sets PIL in %psr to 15, no irqs.
31 sethi %hi(trapbase_cpu1), %g3
33 or %g3, %lo(trapbase_cpu1), %g3
36 sethi %hi(trapbase_cpu2), %g3
38 or %g3, %lo(trapbase_cpu2), %g3
41 sethi %hi(trapbase_cpu3), %g3
43 or %g3, %lo(trapbase_cpu3), %g3
46 /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */
47 set (PSR_PIL | PSR_S | PSR_PS), %g1
48 wr %g1, 0x0, %psr ! traps off though
51 /* Our %wim is one behind CWP */
56 /* This identifies "this cpu". */
60 /* Give ourselves a stack and curptr. */
66 sethi %hi(THREAD_SIZE - STACKFRAME_SZ), %sp
67 or %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp
70 /* Turn on traps (PSR_ET). */
72 wr %g1, PSR_ET, %psr ! traps on
75 /* Init our caches, etc. */
81 /* Start this processor. */
104 __smp4d_processor_id:
105 lda [%g0] ASI_M_VIKING_TMP1, %g2
109 /* CPUID in bootbus can be found at PA 0xff0140000 */
110 #define SUN4D_BOOTBUS_CPUID 0xf0140000
116 /* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */
117 set (PSR_PIL | PSR_S | PSR_PS), %g1
118 wr %g1, 0x0, %psr ! traps off though
121 /* Our %wim is one behind CWP */
126 /* Set tbr - we use just one trap table. */
131 /* Get our CPU id out of bootbus */
132 set SUN4D_BOOTBUS_CPUID, %g3
133 lduba [%g3] ASI_M_CTL, %g3
136 sta %g1, [%g0] ASI_M_VIKING_TMP1
138 /* Give ourselves a stack and curptr. */
143 sethi %hi(THREAD_SIZE - STACKFRAME_SZ), %sp
144 or %sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp
147 /* Turn on traps (PSR_ET). */
149 wr %g1, PSR_ET, %psr ! traps on
152 /* Init our caches, etc. */
158 /* Start this processor. */