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Stephen Rothwell
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Paul Mackerras
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Aug 22, 2007
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refs/heads/master: dc559f7cd5d6d11a99b6c29402b31fbb3f3a1db0 | ||
refs/heads/master: fc68e8699f1f987060ef817cff6a13a7cd7d4c8a |
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/* | ||
* Low level routines for legacy iSeries support. | ||
* | ||
* Extracted from head_64.S | ||
* | ||
* PowerPC version | ||
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | ||
* | ||
* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP | ||
* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> | ||
* Adapted for Power Macintosh by Paul Mackerras. | ||
* Low-level exception handlers and MMU support | ||
* rewritten by Paul Mackerras. | ||
* Copyright (C) 1996 Paul Mackerras. | ||
* | ||
* Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and | ||
* Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com | ||
* | ||
* This file contains the low-level support and setup for the | ||
* PowerPC-64 platform, including trap and interrupt dispatch. | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License | ||
* as published by the Free Software Foundation; either version | ||
* 2 of the License, or (at your option) any later version. | ||
*/ | ||
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#include <asm/reg.h> | ||
#include <asm/ppc_asm.h> | ||
#include <asm/asm-offsets.h> | ||
#include <asm/thread_info.h> | ||
#include <asm/ptrace.h> | ||
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.text | ||
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.globl system_reset_iSeries | ||
system_reset_iSeries: | ||
mfspr r13,SPRN_SPRG3 /* Get paca address */ | ||
mfmsr r24 | ||
ori r24,r24,MSR_RI | ||
mtmsrd r24 /* RI on */ | ||
lhz r24,PACAPACAINDEX(r13) /* Get processor # */ | ||
cmpwi 0,r24,0 /* Are we processor 0? */ | ||
bne 1f | ||
b .__start_initialization_iSeries /* Start up the first processor */ | ||
1: mfspr r4,SPRN_CTRLF | ||
li r5,CTRL_RUNLATCH /* Turn off the run light */ | ||
andc r4,r4,r5 | ||
mtspr SPRN_CTRLT,r4 | ||
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1: | ||
HMT_LOW | ||
#ifdef CONFIG_SMP | ||
lbz r23,PACAPROCSTART(r13) /* Test if this processor | ||
* should start */ | ||
sync | ||
LOAD_REG_IMMEDIATE(r3,current_set) | ||
sldi r28,r24,3 /* get current_set[cpu#] */ | ||
ldx r3,r3,r28 | ||
addi r1,r3,THREAD_SIZE | ||
subi r1,r1,STACK_FRAME_OVERHEAD | ||
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cmpwi 0,r23,0 | ||
beq iSeries_secondary_smp_loop /* Loop until told to go */ | ||
b __secondary_start /* Loop until told to go */ | ||
iSeries_secondary_smp_loop: | ||
/* Let the Hypervisor know we are alive */ | ||
/* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ | ||
lis r3,0x8002 | ||
rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ | ||
#else /* CONFIG_SMP */ | ||
/* Yield the processor. This is required for non-SMP kernels | ||
which are running on multi-threaded machines. */ | ||
lis r3,0x8000 | ||
rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */ | ||
addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */ | ||
li r4,0 /* "yield timed" */ | ||
li r5,-1 /* "yield forever" */ | ||
#endif /* CONFIG_SMP */ | ||
li r0,-1 /* r0=-1 indicates a Hypervisor call */ | ||
sc /* Invoke the hypervisor via a system call */ | ||
mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */ | ||
b 1b /* If SMP not configured, secondaries | ||
* loop forever */ | ||
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_INIT_STATIC(__start_initialization_iSeries) | ||
/* Clear out the BSS */ | ||
LOAD_REG_IMMEDIATE(r11,__bss_stop) | ||
LOAD_REG_IMMEDIATE(r8,__bss_start) | ||
sub r11,r11,r8 /* bss size */ | ||
addi r11,r11,7 /* round up to an even double word */ | ||
rldicl. r11,r11,61,3 /* shift right by 3 */ | ||
beq 4f | ||
addi r8,r8,-8 | ||
li r0,0 | ||
mtctr r11 /* zero this many doublewords */ | ||
3: stdu r0,8(r8) | ||
bdnz 3b | ||
4: | ||
LOAD_REG_IMMEDIATE(r1,init_thread_union) | ||
addi r1,r1,THREAD_SIZE | ||
li r0,0 | ||
stdu r0,-STACK_FRAME_OVERHEAD(r1) | ||
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LOAD_REG_IMMEDIATE(r2,__toc_start) | ||
addi r2,r2,0x4000 | ||
addi r2,r2,0x4000 | ||
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bl .iSeries_early_setup | ||
bl .early_setup | ||
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/* relocation is on at this point */ | ||
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b .start_here_common |
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