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[metal] Add a uprintf() routine, for non-emergency boot logging (#905)

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* [metal] Add a uprintf() routine, for non-emergency boot logging
* [metal] _Really_ push forward timing of VGA TTY initialization
* [metal] Do something useful with uprintf()
* [metal] Locate some ACPI tables, for later hardware detection

Specifically the code now tries to find the ACPI RSDP,
RSDT/XSDT, FADT, & MADT tables, whether in legacy BIOS
bootup mode or in a UEFI bootup.  These are useful for
figuring out how to (re)enable asynchronous interrupts
in legacy 8259 PIC mode.
This commit is contained in:
tkchia 2023-10-26 05:32:20 +08:00 • committed by GitHub
parent 062b2d776e
commit ed17d3008b
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GPG key ID: 4AEE18F83AFDEB23
25 changed files with 999 additions and 36 deletions
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37
libc/intrin/kprintf.greg.c
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@ -385,14 +385,29 @@ privileged long kloghandle(void) {
return __klog_handle;
}
privileged void _klog_serial(const char *b, size_t n) {
size_t i;
uint16_t dx;
unsigned char al;
for (i = 0; i < n; ++i) {
for (;;) {
dx = 0x3F8 + UART_LSR;
asm("inb\t%1,%0" : "=a"(al) : "dN"(dx));
if (al & UART_TTYTXR) break;
asm("pause");
}
dx = 0x3F8;
asm volatile("outb\t%0,%1"
: /* no inputs */
: "a"(b[i]), "dN"(dx));
}
}
privileged void klog(const char *b, size_t n) {
#ifdef __x86_64__
int e;
long h;
size_t i;
uint16_t dx;
uint32_t wrote;
unsigned char al;
long rax, rdi, rsi, rdx;
if ((h = kloghandle()) == -1) {
return;
@ -407,18 +422,7 @@ privileged void klog(const char *b, size_t n) {
if (_weaken(_klog_vga)) {
_weaken(_klog_vga)(b, n);
}
for (i = 0; i < n; ++i) {
for (;;) {
dx = 0x3F8 + UART_LSR;
asm("inb\t%1,%0" : "=a"(al) : "dN"(dx));
if (al & UART_TTYTXR) break;
asm("pause");
}
dx = 0x3F8;
asm volatile("outb\t%0,%1"
: /* no inputs */
: "a"(b[i]), "dN"(dx));
}
_klog_serial(b, n);
} else {
asm volatile("syscall"
: "=a"(rax), "=D"(rdi), "=S"(rsi), "=d"(rdx)
@ -1152,3 +1156,6 @@ privileged void kprintf(const char *fmt, ...) {
kvprintf(fmt, v);
va_end(v);
}
__weak_reference(kprintf, uprintf);
__weak_reference(kvprintf, uvprintf);