korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-27 14:14:24 +08:00
Code Issues Packages Projects Releases Wiki Activity

[PATCH] ARM: remove some entry initialisation asm code

Browse Source 
Convert the trivial vector entry initialisation code to C code.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-04-26 15:17:42 +01:00
parent 2fac6f3fec
commit 7933523dc7
2 changed files with 26 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
arch/arm/kernel/entry-armv.S
View File

@ -522,8 +522,9 @@ ENTRY(__switch_to)
/*
* Vector stubs.
*
* This code is copied to 0x200 or 0xffff0200 so we can use branches in the
* vectors, rather than ldr's.
* This code is copied to 0xffff0200 so we can use branches in the
* vectors, rather than ldr's. Note that this code must not
* exceed 0x300 bytes.
*
* Common stub entry macro:
* Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
@ -552,6 +553,7 @@ vector_\name:
movs pc, lr @ Changes mode and branches
.endm
.globl __stubs_start
__stubs_start:
/*
* Interrupt dispatcher
@ -686,37 +688,24 @@ vector_addrexcptn:
.LCsabt:
.word __temp_abt
.globl __stubs_end
__stubs_end:
.equ __real_stubs_start, .LCvectors + 0x200
.equ stubs_offset, __vectors_start + 0x200 - __stubs_start
.LCvectors:
.globl __vectors_start
__vectors_start:
swi SYS_ERROR0
b __real_stubs_start + (vector_und - __stubs_start)
ldr pc, __real_stubs_start + (.LCvswi - __stubs_start)
b __real_stubs_start + (vector_pabt - __stubs_start)
b __real_stubs_start + (vector_dabt - __stubs_start)
b __real_stubs_start + (vector_addrexcptn - __stubs_start)
b __real_stubs_start + (vector_irq - __stubs_start)
b __real_stubs_start + (vector_fiq - __stubs_start)
b vector_und + stubs_offset
ldr pc, .LCvswi + stubs_offset
b vector_pabt + stubs_offset
b vector_dabt + stubs_offset
b vector_addrexcptn + stubs_offset
b vector_irq + stubs_offset
b vector_fiq + stubs_offset
ENTRY(__trap_init)
stmfd sp!, {r4 - r6, lr}
mov r0, #0xff000000
orr r0, r0, #0x00ff0000 @ high vectors position
adr r1, .LCvectors @ set up the vectors
ldmia r1, {r1, r2, r3, r4, r5, r6, ip, lr}
stmia r0, {r1, r2, r3, r4, r5, r6, ip, lr}
add r2, r0, #0x200
adr r0, __stubs_start @ copy stubs to 0x200
adr r1, __stubs_end
1: ldr r3, [r0], #4
str r3, [r2], #4
cmp r0, r1
blt 1b
LOADREGS(fd, sp!, {r4 - r6, pc})
.globl __vectors_end
__vectors_end:
.data

11
arch/arm/kernel/traps.c
View File

@ -578,9 +578,16 @@ EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
extern void __trap_init(void);
extern char __stubs_start[], __stubs_end[];
extern char __vectors_start[], __vectors_end[];
__trap_init();
/*
* Copy the vectors and stubs (in entry-armv.S) into the
* vector page, mapped at 0xffff0000, and ensure these are
* visible to the instruction stream.
*/
memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start);
memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start);
flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE);
modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
}