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[bios] Allow rtc_entropy.c to be compiled for x86_64 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2016-02-16 16:57:46 +00:00
parent 44e05b0ffc
commit 9c58ba2cd7
1 changed files with 13 additions and 16 deletions
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29
src/arch/i386/interface/pcbios/rtc_entropy.c
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@ -36,10 +36,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <rtc.h>
#include <ipxe/entropy.h>
/** RTC "interrupt triggered" flag */
static uint8_t __text16 ( rtc_flag );
#define rtc_flag __use_text16 ( rtc_flag )
/** RTC interrupt handler */
extern void rtc_isr ( void );
@ -58,23 +54,24 @@ static void rtc_hook_isr ( void ) {
/* Preserve registers */
"pushw %%ax\n\t"
/* Set "interrupt triggered" flag */
"cs movb $0x01, %c0\n\t"
"movb $0x01, %%cs:rtc_flag\n\t"
/* Read RTC status register C to
* acknowledge interrupt
*/
"movb %3, %%al\n\t"
"outb %%al, %1\n\t"
"inb %2\n\t"
"movb %2, %%al\n\t"
"outb %%al, %0\n\t"
"inb %1\n\t"
/* Send EOI */
"movb $0x20, %%al\n\t"
"outb %%al, $0xa0\n\t"
"outb %%al, $0x20\n\t"
/* Restore registers and return */
"popw %%ax\n\t"
"iret\n\t" )
"iret\n\t"
"\nrtc_flag:\n\t"
".byte 0\n\t" )
:
: "p" ( __from_text16 ( &rtc_flag ) ),
"i" ( CMOS_ADDRESS ), "i" ( CMOS_DATA ),
: "i" ( CMOS_ADDRESS ), "i" ( CMOS_DATA ),
"i" ( RTC_STATUS_C ) );
hook_bios_interrupt ( RTC_INT, ( intptr_t ) rtc_isr, &rtc_old_handler );
@ -167,9 +164,9 @@ uint8_t rtc_sample ( void ) {
REAL_CODE ( /* Enable interrupts */
"sti\n\t"
/* Wait for RTC interrupt */
"cs movb %b2, %c4\n\t"
"movb %b2, %%cs:rtc_flag\n\t"
"\n1:\n\t"
"cs xchgb %b2, %c4\n\t" /* Serialize */
"xchgb %b2, %%cs:rtc_flag\n\t" /* Serialize */
"testb %b2, %b2\n\t"
"jz 1b\n\t"
/* Read "before" TSC */
@ -178,9 +175,9 @@ uint8_t rtc_sample ( void ) {
"pushl %0\n\t"
/* Wait for another RTC interrupt */
"xorb %b2, %b2\n\t"
"cs movb %b2, %c4\n\t"
"movb %b2, %%cs:rtc_flag\n\t"
"\n1:\n\t"
"cs xchgb %b2, %c4\n\t" /* Serialize */
"xchgb %b2, %%cs:rtc_flag\n\t" /* Serialize */
"testb %b2, %b2\n\t"
"jz 1b\n\t"
/* Read "after" TSC */
@ -191,7 +188,7 @@ uint8_t rtc_sample ( void ) {
"cli\n\t"
)
: "=a" ( after ), "=d" ( before ), "=q" ( temp )
: "2" ( 0 ), "p" ( __from_text16 ( &rtc_flag ) ) );
: "2" ( 0 ) );
return ( after - before );
}