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This commit is contained in:
rsc 2009-05-31 00:39:17 +00:00
parent 215738336a
commit 030a47736f
4 changed files with 42 additions and 42 deletions
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2
lapic.c
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@ -156,7 +156,7 @@ lapicstartap(uchar apicid, uint addr)
lapicw(ICRLO, INIT | LEVEL | ASSERT);
microdelay(200);
lapicw(ICRLO, INIT | LEVEL);
microdelay(100); // should be 10ms, but too slow in Bochs!
microdelay(100); // should be 10ms, but too slow in Bochs!
// Send startup IPI (twice!) to enter bootstrap code.
// Regular hardware is supposed to only accept a STARTUP

2
proc.h
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@ -32,7 +32,7 @@ struct proc {
uint sz; // Size of process memory (bytes)
char *kstack; // Bottom of kernel stack for this process
enum proc_state state; // Process state
int pid; // Process ID
volatile int pid; // Process ID
struct proc *parent; // Parent process
struct trapframe *tf; // Trap frame for current syscall
struct context *context; // Switch here to run process

74
uart.c
View file

@ -10,67 +10,67 @@
#include "proc.h"
#include "x86.h"
#define COM1 0x3f8
#define COM1 0x3f8
static int uart; // is there a uart?
static int uart; // is there a uart?
void
uartinit(void)
{
char *p;
char *p;
// Turn off the FIFO
outb(COM1+2, 0);
// Turn off the FIFO
outb(COM1+2, 0);
// 9600 baud, 8 data bits, 1 stop bit, parity off.
outb(COM1+3, 0x80); // Unlock divisor
outb(COM1+0, 115200/9600);
outb(COM1+1, 0);
outb(COM1+3, 0x03); // Lock divisor, 8 data bits.
outb(COM1+4, 0);
outb(COM1+1, 0x01); // Enable receive interrupts.
// 9600 baud, 8 data bits, 1 stop bit, parity off.
outb(COM1+3, 0x80); // Unlock divisor
outb(COM1+0, 115200/9600);
outb(COM1+1, 0);
outb(COM1+3, 0x03); // Lock divisor, 8 data bits.
outb(COM1+4, 0);
outb(COM1+1, 0x01); // Enable receive interrupts.
// If status is 0xFF, no serial port.
if(inb(COM1+5) == 0xFF)
return;
uart = 1;
// If status is 0xFF, no serial port.
if(inb(COM1+5) == 0xFF)
return;
uart = 1;
// Acknowledge pre-existing interrupt conditions;
// enable interrupts.
inb(COM1+2);
inb(COM1+0);
picenable(IRQ_COM1);
ioapicenable(IRQ_COM1, 0);
// Acknowledge pre-existing interrupt conditions;
// enable interrupts.
inb(COM1+2);
inb(COM1+0);
picenable(IRQ_COM1);
ioapicenable(IRQ_COM1, 0);
// Announce that we're here.
for(p="xv6...\n"; *p; p++)
uartputc(*p);
// Announce that we're here.
for(p="xv6...\n"; *p; p++)
uartputc(*p);
}
void
uartputc(int c)
{
int i;
int i;
if(!uart)
return;
for(i = 0; i < 128 && !(inb(COM1+5) & 0x20); i++)
microdelay(10);
outb(COM1+0, c);
if(!uart)
return;
for(i = 0; i < 128 && !(inb(COM1+5) & 0x20); i++)
microdelay(10);
outb(COM1+0, c);
}
static int
uartgetc(void)
{
if(!uart)
return -1;
if(!(inb(COM1+5) & 0x01))
return -1;
return inb(COM1+0);
if(!uart)
return -1;
if(!(inb(COM1+5) & 0x01))
return -1;
return inb(COM1+0);
}
void
uartintr(void)
{
consoleintr(uartgetc);
consoleintr(uartgetc);
}