0a55e63413
- two CPUs can issue IPI to each other now without any hazzard - we must be able to handle synchronous scheduling IPIs from other CPUs when we are waiting for attention from another one. Otherwise we might livelock. - necessary barriers to prevent reordering
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* This file contains a collection of miscellaneous procedures:
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* panic: abort MINIX due to a fatal error
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* kputc: buffered putc used by kernel printf
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*/
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#include "kernel.h"
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#include "proc.h"
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#include <minix/syslib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <signal.h>
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#include <minix/sys_config.h>
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#define ARE_PANICING 0xDEADC0FF
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/*===========================================================================*
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* panic *
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*===========================================================================*/
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PUBLIC void panic(const char *fmt, ...)
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{
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va_list arg;
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/* The system has run aground of a fatal kernel error. Terminate execution. */
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if (minix_panicing == ARE_PANICING) {
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arch_monitor();
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}
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minix_panicing = ARE_PANICING;
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if (fmt != NULL) {
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printf("kernel panic: ");
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va_start(arg, fmt);
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vprintf(fmt, arg);
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printf("\n");
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}
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printf("kernel on CPU %d: ", cpuid);
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util_stacktrace();
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printf("current process : ");
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proc_stacktrace(get_cpulocal_var(proc_ptr));
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/* Abort MINIX. */
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minix_shutdown(NULL);
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}
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/*===========================================================================*
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* kputc *
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*===========================================================================*/
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PUBLIC void kputc(c)
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int c; /* character to append */
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{
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/* Accumulate a single character for a kernel message. Send a notification
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* to the output driver if an END_OF_KMESS is encountered.
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*/
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if (c != END_OF_KMESS) {
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#ifdef DEBUG_SERIAL
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if (do_serial_debug) {
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if(c == '\n')
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ser_putc('\r');
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ser_putc(c);
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}
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#endif
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kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
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if (kmess.km_size < sizeof(kmess.km_buf))
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kmess.km_size += 1;
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kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE;
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} else {
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int p;
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endpoint_t outprocs[] = OUTPUT_PROCS_ARRAY;
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if(!(minix_panicing || do_serial_debug)) {
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for(p = 0; outprocs[p] != NONE; p++) {
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if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
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send_sig(outprocs[p], SIGKMESS);
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}
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}
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}
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}
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return;
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}
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PUBLIC void cpu_print_freq(unsigned cpu)
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{
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u64_t freq;
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freq = cpu_get_freq(cpu);
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printf("CPU %d freq %lu MHz\n", cpu, div64u(freq, 1000000));
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}
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PUBLIC int is_fpu(void)
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{
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return get_cpulocal_var(fpu_presence);
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}
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