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Map the kernel very early if needed.

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Implement sigcode.
This commit is contained in:
Olivier Houchard 2004-09-23 21:49:10 +00:00
parent f186a29521
commit 6f358f0045
1 changed files with 48 additions and 14 deletions
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62
sys/arm/arm/locore.S
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@ -33,6 +33,7 @@
*/
#include "assym.s"
#include <sys/syscall.h>
#include <machine/asm.h>
#include <machine/armreg.h>
#include <machine/pte.h>
@ -63,9 +64,17 @@ __FBSDID("$FreeBSD$");
ENTRY_NP(btext)
ASENTRY_NP(_start)
/* Check if we are running on RAM, if not move ourself to RAM */
cmp pc, #KERNPHYSADDR
#if 0
cmp pc, #PHYSADDR
bhi start_inram /* XXX: This is wrong */
#endif
b start_inram /*
* XXX: this is even more wrong, but RedBoot
* use 0x00000000-0x100000000 as virtual
* addresses for the RAM.
*/
/* move me to RAM
* XXX: we can use memcpy if it is PIC
@ -74,7 +83,7 @@ ASENTRY_NP(_start)
adr r0, _C_LABEL(_start)
add r1, r1, #3
mov r1, r1, LSR #2
mov r2, #KERNPHYSADDR
mov r2, #PHYSADDR
add r2, r2, #0x00200000
mov r4, r2
@ -90,13 +99,22 @@ ASENTRY_NP(_start)
Lcopy_size: .word _edata-_C_LABEL(_start)
Lstart_off: .word start_inram-_C_LABEL(_start)
start_inram:
#ifdef STARTUP_PAGETABLE_ADDR
adr r4, mmu_init_table2
adr r7, Lunmapped
bic r7, r7, #0xff000000
orr r7, r7, #PHYSADDR
mrc p15, 0, r2, c1, c0, 0
tst r2, #CPU_CONTROL_MMU_ENABLE /* we already have a page table? */
bne 3f
/* Disable MMU for a while */
mrc p15, 0, r2, c1, c0, 0
bic r2, r2, #CPU_CONTROL_MMU_ENABLE
mcr p15, 0, r2, c1, c0, 0
nop
nop
nop
mov pc, r7
Lunmapped:
#ifdef STARTUP_PAGETABLE_ADDR
/* build page table from scratch */
ldr r0, Lstartup_pagetable
adr r4, mmu_init_table
@ -127,7 +145,6 @@ start_inram:
CPWAIT(r0)
bl mmu_done
mmu_done:
#endif
adr r1, .Lstart
@ -140,7 +157,7 @@ mmu_done:
subs r2, r2, #4
bgt .L1
mov fp, #0xc0000000 /* trace back starts here */
ldr fp, =KERNVIRTADDR /* trace back starts here */
bl _C_LABEL(initarm) /* Off we go */
/* init arm will return the new stack pointer. */
@ -167,10 +184,10 @@ mmu_init_table:
/* fill all table VA==PA */
MMU_INIT(0x00000000, 0x00000000, 1<<(32-L1_S_SHIFT), L1_TYPE_S|L1_S_AP(AP_KRW))
/* map SDRAM VA==PA, WT cacheable */
MMU_INIT(KERNPHYSADDR, KERNPHYSADDR, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
mmu_init_table2:
/* map VA 0xc0000000..0xc3ffffff to PA 0xa0000000..0xa3ffffff */
MMU_INIT(0xc0000000, KERNPHYSADDR, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
MMU_INIT(PHYSADDR, PHYSADDR , 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
/* map VA 0xc0000000..0xc3ffffff to PA */
MMU_INIT(KERNBASE, PHYSADDR, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
MMU_INIT(0xfe800000, 0xfe800000, 1<<(32-L1_S_SHIFT), L1_TYPE_S|L1_S_AP(AP_KRW))
.word 0 /* end of table */
#endif
@ -196,7 +213,7 @@ svcstk:
.Lcpufuncs:
.word _C_LABEL(cpufuncs)
ENTRY_NP(cpu_reset)
ENTRY_NP(cpu_halt)
mrs r2, cpsr
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_SVC32_MODE)
@ -305,4 +322,21 @@ _C_LABEL(esym): .word _C_LABEL(end)
ENTRY_NP(abort)
b _C_LABEL(abort)
ENTRY_NP(sigcode)
mov r0, sp
swi SYS_sigreturn
/* Well if that failed we better exit quick ! */
swi SYS_exit
b . - 8
.align 0
.global _C_LABEL(esigcode)
_C_LABEL(esigcode):
.data
.global szsigcode
szsigcode:
.long esigcode-sigcode
/* End of locore.S */