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Cosmetics, coding style fixes (trivial).

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Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3180 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Uwe Hermann
2008-03-20 19:54:59 +00:00
parent 5f4c8abb65
commit 6a441bfb46
22 changed files with 348 additions and 401 deletions
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46
payloads/libpayload/i386/timer.c
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@ -32,53 +32,47 @@
static unsigned int cpu_khz;
/* Calculate the speed of the processor for use in delays */
/**
* Calculate the speed of the processor for use in delays.
*
* @return The CPU speed in kHz.
*/
unsigned int get_cpu_speed(void)
{
unsigned long long start, end;
/* Set up the PPC port - disable the speaker,
* enable the T2 gate */
/* Set up the PPC port - disable the speaker, enable the T2 gate. */
outb((inb(0x61) & ~0x02) | 0x01, 0x61);
/* Set the PIT to Mode 0, counter 2, word access */
/* Set the PIT to Mode 0, counter 2, word access. */
outb(0xB0, 0x43);
/* Load the counter with 0xFFFF */
outb(0xFF, 0x42);
outb(0xFF, 0x42);
/* Read the number of ticks during the period */
/* Load the counter with 0xffff. */
outb(0xff, 0x42);
outb(0xff, 0x42);
/* Read the number of ticks during the period. */
start = rdtsc();
while(!(inb(0x61) & 0x20));
while (!(inb(0x61) & 0x20)) ;
end = rdtsc();
/* The clock rate is 1193180 Hz
* the number of miliseconds for a period
* of 0xFFFF is 1193180 / (0xFFFF * 1000)
* or .0182. Multiply that by the number of
* measured clocks to get the khz value
*/
cpu_khz =
(unsigned int ) ((end - start) * 1193180U / (1000 * 0xFFFF));
/*
* The clock rate is 1193180 Hz, the number of miliseconds for a
* period of 0xffff is 1193180 / (0xFFFF * 1000) or .0182.
* Multiply that by the number of measured clocks to get the kHz value.
*/
cpu_khz = (unsigned int)((end - start) * 1193180U / (1000 * 0xffff));
}
/* Global delay functions */
static inline void _delay(unsigned int delta)
{
unsigned long long timeout = rdtsc() + delta;
while (rdtsc() < timeout);
while (rdtsc() < timeout) ;
}
void ndelay(unsigned int n)
{
_delay(n * cpu_khz / 1000000);
_delay(n * cpu_khz / 1000000);
}
void mdelay(unsigned int m)