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Do core interrupt masking in a less general fashion and save some instructions to decrease size and speed things up a little bit. Small fix to a few places where interrupts would get enabled again where they shouldn't have been (context switching calls when disabled).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16811 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-03-26 01:50:41 +00:00
parent 74d678fdbc
commit af395f4db6
61 changed files with 381 additions and 278 deletions
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49
firmware/target/coldfire/system-target.h
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@ -81,13 +81,54 @@ static inline int set_irq_level(int level)
{
int oldlevel;
/* Read the old level and set the new one */
asm volatile ("move.w %%sr, %0 \n"
"bset.l #13, %1 \n" /* Keep supervisor state set */
"move.w %1, %%sr \n"
: "=d"(oldlevel), "+d"(level));
/* Not volatile - can be removed if oldlevel isn't used */
asm ("move.w %%sr, %0" : "=d"(oldlevel));
/* Keep supervisor state set */
asm volatile ("move.w %0, %%sr \n" : : "d"(level | 0x2000));
return oldlevel;
}
/* Enable all interrupts */
static inline void enable_irq(void)
{
int tmp;
/* Using move.w over the compiler's move.l saves 2 bytes per instance */
asm volatile ("move.w %1, %0 \n"
"move.w %0, %%sr \n"
: "=&d"(tmp) : "i"(0x2000));
}
/* Disable interrupts up to HIGHEST_IRQ_LEVEL */
static inline void disable_irq(void)
{
int tmp;
/* Using move.w over the compiler's move.l saves 2 bytes per instance */
asm volatile ("move.w %1, %0 \n"
"move.w %0, %%sr \n"
: "=&d"(tmp)
: "i"(0x2000 | HIGHEST_IRQ_LEVEL));
}
static inline int disable_irq_save(void)
{
int oldlevel, tmp;
/* Using move.w over the compiler's move.l saves 2 bytes per instance */
asm volatile ("move.w %%sr, %1 \n"
"move.w %2, %0 \n"
"move.w %0, %%sr \n"
: "=&d"(tmp), "=d"(oldlevel)
: "i"(0x2000 | HIGHEST_IRQ_LEVEL));
return oldlevel;
}
static inline void restore_irq(int oldlevel)
{
/* Restore the sr value returned by disable_irq_save or
* set_irq_level */
asm volatile ("move.w %0, %%sr" : : "d"(oldlevel));
}
static inline uint16_t swap16(uint16_t value)
/*
result[15..8] = value[ 7..0];