From 5753553213df8f9de851adb68377db43faecb91f Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 11 Jun 2019 09:57:14 -0400
Subject: separate source into kernel/ user/ mkfs/
---
uart.c | 75 ------------------------------------------------------------------
1 file changed, 75 deletions(-)
delete mode 100644 uart.c
(limited to 'uart.c')
diff --git a/uart.c b/uart.c
deleted file mode 100644
index 35fac1b..0000000
--- a/uart.c
+++ /dev/null
@@ -1,75 +0,0 @@
-#include "types.h"
-#include "param.h"
-#include "memlayout.h"
-#include "riscv.h"
-#include "proc.h"
-#include "spinlock.h"
-#include "defs.h"
-
-//
-// qemu -machine virt has a 16550a UART
-// qemu/hw/riscv/virt.c
-// http://byterunner.com/16550.html
-//
-// caller should lock.
-//
-
-// address of one of the registers
-#define R(reg) ((volatile unsigned char *)(UART0 + reg))
-
-void
-uartinit(void)
-{
- // disable interrupts -- IER
- *R(1) = 0x00;
-
- // special mode to set baud rate
- *R(3) = 0x80;
-
- // LSB for baud rate of 38.4K
- *R(0) = 0x03;
-
- // MSB for baud rate of 38.4K
- *R(1) = 0x00;
-
- // leave set-baud mode,
- // and set word length to 8 bits, no parity.
- *R(3) = 0x03;
-
- // reset and enable FIFOs -- FCR.
- *R(2) = 0x07;
-
- // enable receive interrupts -- IER.
- *R(1) = 0x01;
-}
-
-void
-uartputc(int c)
-{
- // wait for Transmit Holding Empty to be set in LSR.
- while((*R(5) & (1 << 5)) == 0)
- ;
- *R(0) = c;
-}
-
-int
-uartgetc(void)
-{
- if(*R(5) & 0x01){
- // input data is ready.
- return *R(0);
- } else {
- return -1;
- }
-}
-
-void
-uartintr(void)
-{
- while(1){
- int c = uartgetc();
- if(c == -1)
- break;
- consoleintr(c);
- }
-}
--
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