/*
* This file contains the 64-bit "server" PowerPC variant
* of the low level exception handling including exception
* vectors, exception return, part of the slb and stab
* handling and other fixed offset specific things.
*
* This file is meant to be #included from head_64.S due to
* position dependent assembly.
*
* Most of this originates from head_64.S and thus has the same
* copyright history.
*
*/
#include <asm/hw_irq.h>
#include <asm/exception-64s.h>
#include <asm/ptrace.h>
/*
* We layout physical memory as follows:
* 0x0000 - 0x00ff : Secondary processor spin code
* 0x0100 - 0x17ff : pSeries Interrupt prologs
* 0x1800 - 0x4000 : interrupt support common interrupt prologs
* 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
* 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
* 0x7000 - 0x7fff : FWNMI data area
* 0x8000 - 0x8fff : Initial (CPU0) segment table
* 0x9000 - : Early init and support code
*/
/* Syscall routine is used twice, in reloc-off and reloc-on paths */
#define SYSCALL_PSERIES_1 \
BEGIN_FTR_SECTION \
cmpdi r0,0x1ebe ; \
beq- 1f ; \
END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
mr r9,r13 ; \
GET_PACA(r13) ; \
mfspr r11,SPRN_SRR0 ; \
0:
#define SYSCALL_PSERIES_2_RFID \
mfspr r12,SPRN_SRR1 ; \
ld r10,PACAKBASE(r13) ; \
LOAD_HANDLER(r10, system_call_entry) ; \
mtspr SPRN_SRR0,r10 ; \
ld r10,PACAKMSR(r13) ; \
mtspr SPRN_SRR1,r10 ; \
rfid ; \
b . ; /* prevent speculative execution */
#define SYSCALL_PSERIES_3 \
/* Fast LE/BE switch system call */ \
1: mfspr r12,SPRN_SRR1 ; \
xori r12,r12,MSR_LE ; \
mtspr SPRN_SRR1,r12 ; \
rfid ; /* return to userspace */ \
b . ; \
2: mfspr r12,SPRN_SRR1 ; \
andi. r12,r12,MSR_PR ; \
bne 0b ; \
mtspr SPRN_SRR0,r3 ; \
mtspr SPRN_SRR1,r4 ; \
mtspr SPRN_SDR1,r5 ; \
rfid ; \
b . ; /* prevent speculative execution */
#if defined(CONFIG_RELOCATABLE)
/*
* We can't branch directly; in the direct case we use LR
* and system_call_entry restores LR. (We thus need to move
* LR to r10 in the RFID case too.)
*/
#define SYSCALL_PSERIES_2_DIRECT \
mflr r10 ; \
ld r12,PACAKBASE(r13) ; \
LOAD_HANDLER(r12, system_call_entry_direct
