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Get binaries closer to running without an o/s

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blinkenlights now does a pretty good job emulating what happens when
binaries boot from BIOS into long mode. So it's been much easier to
debug the bare metal process and wrinkle out many issues.
This commit is contained in:
Justine Tunney 2020-10-29 04:53:20 -07:00
parent feed0d2b0e
commit 2d80bbc802
50 changed files with 974 additions and 1062 deletions
Download patch file Download diff file Expand all files Collapse all files

36
tool/build/lib/ioports.c
View file

@ -18,6 +18,7 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/iovec.h"
#include "libc/nexgen32e/uart.h"
#include "libc/sysv/consts/fileno.h"
#include "tool/build/lib/ioports.h"
@ -42,10 +43,42 @@ static void OpE9Write(struct Machine *m, uint8_t b) {
m->fds.p[fd].cb->writev(m->fds.p[fd].fd, &(struct iovec){&b, 1}, 1);
}
static int OpSerialIn(struct Machine *m, int r) {
switch (r) {
case UART_DLL:
if (!m->dlab) {
return OpE9Read(m);
} else {
return 0x01;
}
case UART_LSR:
return UART_TTYDA | UART_TTYTXR | UART_TTYIDL;
default:
return 0;
}
}
static void OpSerialOut(struct Machine *m, int r, uint32_t x) {
switch (r) {
case UART_DLL:
if (!m->dlab) {
return OpE9Write(m, x);
}
break;
case UART_LCR:
m->dlab = !!(x & UART_DLAB);
break;
default:
break;
}
}
uint64_t OpIn(struct Machine *m, uint16_t p) {
switch (p) {
case 0xE9:
return OpE9Read(m);
case 0x3F8 ... 0x3FF:
return OpSerialIn(m, p - 0x3F8);
default:
return -1;
}
@ -56,6 +89,9 @@ void OpOut(struct Machine *m, uint16_t p, uint32_t x) {
case 0xE9:
OpE9Write(m, x);
break;
case 0x3F8 ... 0x3FF:
OpSerialOut(m, p - 0x3F8, x);
break;
default:
break;
}