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PP5020/PP5024: Add ASM optimized inline current_core.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13155 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-04-14 11:15:43 +00:00
parent 0b7bb31453
commit 036168cbf9
2 changed files with 20 additions and 10 deletions
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10
firmware/system.c
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@ -276,16 +276,6 @@ void irq(void)
#endif #endif
#endif /* BOOTLOADER */ #endif /* BOOTLOADER */
unsigned int current_core(void)
{
if((PROCESSOR_ID & 0xff) == PROC_ID_CPU)
{
return CPU;
}
return COP;
}
/* TODO: The following two function have been lifted straight from IPL, and /* TODO: The following two function have been lifted straight from IPL, and
hence have a lot of numeric addresses used straight. I'd like to use hence have a lot of numeric addresses used straight. I'd like to use
#defines for these, but don't know what most of them are for or even what #defines for these, but don't know what most of them are for or even what

20
firmware/target/arm/system-target.h
View file

@ -36,7 +36,27 @@ static inline void udelay(unsigned usecs)
while (TIME_BEFORE(USEC_TIMER, stop)); while (TIME_BEFORE(USEC_TIMER, stop));
} }
#if CONFIG_CPU == PP5020 || CONFIG_CPU == PP5024
static inline unsigned int current_core(void)
{
/*
* PROCESSOR_ID seems to be 32-bits:
* CPU = 0x55555555 = |01010101|01010101|01010101|01010101|
* COP = 0xaaaaaaaa = |10101010|10101010|10101010|10101010|
* ^
*/
unsigned int core;
asm volatile (
"ldr %0, =0x60000000 \r\n" /* PROCESSOR_ID */
"ldrb %0, [%0] \r\n" /* Just load the LSB */
"mov %0, %0, lsr #7 \r\n" /* Bit 7 => index */
: "=&r"(core) /* CPU=0, COP=1 */
);
return core;
}
#else
unsigned int current_core(void); unsigned int current_core(void);
#endif
#if CONFIG_CPU != PP5002 #if CONFIG_CPU != PP5002