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ANDROID: ARM: fiq_glue: Add custom fiq return handler api.

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Change-Id: I5ff2764e85151ca0a88576542fda07c2d33dd065
Signed-off-by: Arve Hjønnevåg <arve@android.com>
This commit is contained in:
Arve Hjønnevåg
2013-06-24 18:02:05 -07:00
committed by Dmitry Shmidt
parent dad5647a8c
commit 6c0dda2cf3
3 changed files with 69 additions and 12 deletions
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25
arch/arm/common/fiq_glue.S
View File

@@ -22,13 +22,14 @@
/* fiq stack: r0-r15,cpsr,spsr of interrupted mode */
ENTRY(fiq_glue)
/* store pc, cpsr from previous mode */
/* store pc, cpsr from previous mode, reserve space for spsr */
mrs r12, spsr
sub r11, lr, #4
sub lr, lr, #4
subs r10, #1
bne nested_fiq
stmfd sp!, {r11-r12, lr}
str r12, [sp, #-8]!
str lr, [sp, #-4]!
/* store r8-r14 from previous mode */
sub sp, sp, #(7 * 4)
@@ -85,12 +86,15 @@ fiq_from_usr_mode_exit:
msr cpsr_c, #(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)
ldmfd sp!, {r0-r7}
add sp, sp, #(7 * 4)
ldmfd sp!, {r11-r12, lr}
ldr lr, [sp, #(4 * 7)]
ldr r12, [sp, #(4 * 8)]
add sp, sp, #(10 * 4)
exit_fiq:
msr spsr_cxsf, r12
add r10, #1
movs pc, r11
cmp r11, #0
moveqs pc, lr
bx r11 /* jump to custom fiq return function */
nested_fiq:
orr r12, r12, #(PSR_F_BIT)
@@ -98,14 +102,17 @@ nested_fiq:
fiq_glue_end:
ENTRY(fiq_glue_setup) /* func, data, sp */
mrs r3, cpsr
ENTRY(fiq_glue_setup) /* func, data, sp, smc call number */
stmfd sp!, {r4}
mrs r4, cpsr
msr cpsr_c, #(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)
movs r8, r0
mov r9, r1
mov sp, r2
mov r11, r3
moveq r10, #0
movne r10, #1
msr cpsr_c, r3
msr cpsr_c, r4
ldmfd sp!, {r4}
bx lr

53
arch/arm/common/fiq_glue_setup.c
View File

@@ -18,20 +18,23 @@
#include <asm/fiq_glue.h>
extern unsigned char fiq_glue, fiq_glue_end;
extern void fiq_glue_setup(void *func, void *data, void *sp);
extern void fiq_glue_setup(void *func, void *data, void *sp,
fiq_return_handler_t fiq_return_handler);
static struct fiq_handler fiq_debbuger_fiq_handler = {
.name = "fiq_glue",
};
DEFINE_PER_CPU(void *, fiq_stack);
static struct fiq_glue_handler *current_handler;
static fiq_return_handler_t fiq_return_handler;
static DEFINE_MUTEX(fiq_glue_lock);
static void fiq_glue_setup_helper(void *info)
{
struct fiq_glue_handler *handler = info;
fiq_glue_setup(handler->fiq, handler,
__get_cpu_var(fiq_stack) + THREAD_START_SP);
__get_cpu_var(fiq_stack) + THREAD_START_SP,
fiq_return_handler);
}
int fiq_glue_register_handler(struct fiq_glue_handler *handler)
@@ -80,6 +83,49 @@ err_busy:
return ret;
}
static void fiq_glue_update_return_handler(void (*fiq_return)(void))
{
fiq_return_handler = fiq_return;
if (current_handler)
on_each_cpu(fiq_glue_setup_helper, current_handler, true);
}
int fiq_glue_set_return_handler(void (*fiq_return)(void))
{
int ret;
mutex_lock(&fiq_glue_lock);
if (fiq_return_handler) {
ret = -EBUSY;
goto err_busy;
}
fiq_glue_update_return_handler(fiq_return);
ret = 0;
err_busy:
mutex_unlock(&fiq_glue_lock);
return ret;
}
EXPORT_SYMBOL(fiq_glue_set_return_handler);
int fiq_glue_clear_return_handler(void (*fiq_return)(void))
{
int ret;
mutex_lock(&fiq_glue_lock);
if (WARN_ON(fiq_return_handler != fiq_return)) {
ret = -EINVAL;
goto err_inval;
}
fiq_glue_update_return_handler(NULL);
ret = 0;
err_inval:
mutex_unlock(&fiq_glue_lock);
return ret;
}
EXPORT_SYMBOL(fiq_glue_clear_return_handler);
/**
* fiq_glue_resume - Restore fiqs after suspend or low power idle states
*
@@ -93,7 +139,8 @@ void fiq_glue_resume(void)
if (!current_handler)
return;
fiq_glue_setup(current_handler->fiq, current_handler,
__get_cpu_var(fiq_stack) + THREAD_START_SP);
__get_cpu_var(fiq_stack) + THREAD_START_SP,
fiq_return_handler);
if (current_handler->resume)
current_handler->resume(current_handler);
}

3
arch/arm/include/asm/fiq_glue.h
View File

@@ -18,8 +18,11 @@ struct fiq_glue_handler {
void (*fiq)(struct fiq_glue_handler *h, void *regs, void *svc_sp);
void (*resume)(struct fiq_glue_handler *h);
};
typedef void (*fiq_return_handler_t)(void);
int fiq_glue_register_handler(struct fiq_glue_handler *handler);
int fiq_glue_set_return_handler(fiq_return_handler_t fiq_return);
int fiq_glue_clear_return_handler(fiq_return_handler_t fiq_return);
#ifdef CONFIG_FIQ_GLUE
void fiq_glue_resume(void);