f65b3b8fbf
interrupts to avoid clobbering register B. This seems to have fixed the corrupting-CMOS bug when enabling profiling.
103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
/* system dependent functions for use inside the whole kernel. */
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#include "../../kernel.h"
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#include <unistd.h>
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#include <ibm/cmos.h>
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#include <ibm/bios.h>
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#include <minix/portio.h>
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#include "proto.h"
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PUBLIC void arch_shutdown(int how)
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{
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/* Mask all interrupts, including the clock. */
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outb( INT_CTLMASK, ~0);
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if(how != RBT_RESET) {
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/* return to boot monitor */
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outb( INT_CTLMASK, 0);
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outb( INT2_CTLMASK, 0);
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/* Return to the boot monitor. Set
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* the program if not already done.
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*/
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if (how != RBT_MONITOR)
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phys_copy(vir2phys(""), kinfo.params_base, 1);
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level0(monitor);
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} else {
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/* Reset the system by forcing a processor shutdown. First stop
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* the BIOS memory test by setting a soft reset flag.
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*/
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u16_t magic = STOP_MEM_CHECK;
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phys_copy(vir2phys(&magic), SOFT_RESET_FLAG_ADDR,
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SOFT_RESET_FLAG_SIZE);
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level0(reset);
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}
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}
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PUBLIC void system_init(void)
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{
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prot_init();
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}
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#define COM1_BASE 0x3F8
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#define COM1_THR (COM1_BASE + 0)
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#define LSR_THRE 0x20
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#define COM1_LSR (COM1_BASE + 5)
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PUBLIC void ser_putc(char c)
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{
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int i;
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int lsr, thr;
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lsr= COM1_LSR;
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thr= COM1_THR;
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for (i= 0; i<100000; i++)
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{
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if (inb( lsr) & LSR_THRE)
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break;
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}
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outb( thr, c);
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}
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#if SPROFILE
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PUBLIC int arch_init_profile_clock(u32_t freq)
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{
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int r;
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/* Set CMOS timer frequency. */
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outb(RTC_INDEX, RTC_REG_A);
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outb(RTC_IO, RTC_A_DV_OK | freq);
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/* Enable CMOS timer interrupts. */
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outb(RTC_INDEX, RTC_REG_B);
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r = inb(RTC_IO);
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outb(RTC_INDEX, RTC_REG_B);
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outb(RTC_IO, r | RTC_B_PIE);
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/* Mandatory read of CMOS register to enable timer interrupts. */
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outb(RTC_INDEX, RTC_REG_C);
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inb(RTC_IO);
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return CMOS_CLOCK_IRQ;
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}
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PUBLIC void arch_stop_profile_clock(void)
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{
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int r;
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/* Disable CMOS timer interrupts. */
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outb(RTC_INDEX, RTC_REG_B);
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r = inb(RTC_IO);
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outb(RTC_INDEX, RTC_REG_B);
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outb(RTC_IO, r & ~RTC_B_PIE);
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}
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PUBLIC void arch_ack_profile_clock(void)
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{
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/* Mandatory read of CMOS register to re-enable timer interrupts. */
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outb(RTC_INDEX, RTC_REG_C);
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inb(RTC_IO);
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}
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#endif
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