| /* |
| * 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. |
| */ |
| |
| #include <asm/reg.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/thread_info.h> |
| #include <asm/ptrace.h> |
| |
| .text |
| |
| .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 |
| |
| 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 |
| |
| 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 */ |
| |
| _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) |
| |
| LOAD_REG_IMMEDIATE(r2,__toc_start) |
| addi r2,r2,0x4000 |
| addi r2,r2,0x4000 |
| |
| bl .iSeries_early_setup |
| bl .early_setup |
| |
| /* relocation is on at this point */ |
| |
| b .start_here_common |