reorganize source

[com32] / src / timer.c

diff --git a/src/timer.c b/src/timer.c
deleted file mode 100644 (file)
index c050b84..0000000
--- a/src/timer.c
+++ /dev/null
@@ -1,192 +0,0 @@
-/*
-pcboot - bootable PC demo/game kernel
-Copyright (C) 2018-2023 John Tsiombikas <nuclear@member.fsf.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY, without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <https://www.gnu.org/licenses/>.
-*/
-#include <stdio.h>
-#include "intr.h"
-#include "asmops.h"
-#include "timer.h"
-#include "panic.h"
-#include "config.h"
-
-/* frequency of the oscillator driving the 8254 timer */
-#define OSC_FREQ_HZ            1193182
-
-/* macro to divide and round to the nearest integer */
-#define DIV_ROUND(a, b) ((a) / (b) + ((a) % (b)) / ((b) / 2))
-
-/* I/O ports connected to the 8254 */
-#define PORT_DATA0     0x40
-#define PORT_DATA1     0x41
-#define PORT_DATA2     0x42
-#define PORT_CMD       0x43
-
-/* command bits */
-#define CMD_CHAN0                      0
-#define CMD_CHAN1                      (1 << 6)
-#define CMD_CHAN2                      (2 << 6)
-#define CMD_RDBACK                     (3 << 6)
-
-#define CMD_LATCH                      0
-#define CMD_ACCESS_LOW         (1 << 4)
-#define CMD_ACCESS_HIGH                (2 << 4)
-#define CMD_ACCESS_BOTH                (3 << 4)
-
-#define CMD_OP_INT_TERM                0
-#define CMD_OP_ONESHOT         (1 << 1)
-#define CMD_OP_RATE                    (2 << 1)
-#define CMD_OP_SQWAVE          (3 << 1)
-#define CMD_OP_SOFT_STROBE     (4 << 1)
-#define CMD_OP_HW_STROBE       (5 << 1)
-
-#define CMD_MODE_BIN           0
-#define CMD_MODE_BCD           1
-
-volatile unsigned long nticks;
-
-struct timer_event {
-       int dt; /* remaining ticks delta from the previous event */
-       void (*func)(void);
-       struct timer_event *next;
-};
-
-static void timer_handler(int inum);
-
-static struct timer_event *evlist;
-
-
-void init_timer(void)
-{
-       /* calculate the reload count: round(osc / freq) */
-       int reload_count = DIV_ROUND(OSC_FREQ_HZ, TICK_FREQ_HZ);
-
-       /* set the mode to square wave for channel 0, both low
-        * and high reload count bytes will follow...
-        */
-       outp(PORT_CMD, CMD_CHAN0 | CMD_ACCESS_BOTH | CMD_OP_SQWAVE);
-
-       /* write the low and high bytes of the reload count to the
-        * port for channel 0
-        */
-       outp(PORT_DATA0, reload_count & 0xff);
-       outp(PORT_DATA0, (reload_count >> 8) & 0xff);
-
-       /* set the timer interrupt handler */
-       interrupt(IRQ_TO_INTR(0), timer_handler);
-       unmask_irq(0);
-}
-
-void cleanup_timer(void)
-{
-       /* return the timer to the original rate */
-       outp(PORT_CMD, CMD_CHAN0 | CMD_ACCESS_BOTH | CMD_OP_SQWAVE);
-       outp(PORT_DATA0, 0);
-       outp(PORT_DATA0, 0);
-}
-
-void set_alarm(unsigned long msec, void (*func)(void))
-{
-       int ticks, tsum, iflag;
-       struct timer_event *ev, *node;
-
-       if((ticks = MSEC_TO_TICKS(msec)) <= 0) {
-               return;
-       }
-
-       if(!(ev = malloc(sizeof *ev))) {
-               panic("failed to allocate timer event");
-               return;
-       }
-       ev->func = func;
-
-       iflag = get_intr_flag();
-       disable_intr();
-
-       if(!evlist || ticks < evlist->dt) {
-               /* insert at the begining */
-               ev->next = evlist;
-               evlist = ev;
-
-               ev->dt = ticks;
-               if(ev->next) {
-                       ev->next->dt -= ticks;
-               }
-       } else {
-               tsum = evlist->dt;
-               node = evlist;
-
-               while(node->next && ticks > tsum + node->next->dt) {
-                       tsum += node->next->dt;
-                       node = node->next;
-               }
-
-               ev->next = node->next;
-               node->next = ev;
-
-               /* fix the relative times */
-               ev->dt = ticks - tsum;
-               if(ev->next) {
-                       ev->next->dt -= ev->dt;
-               }
-       }
-
-       set_intr_flag(iflag);
-}
-
-void cancel_alarm(void (*func)(void))
-{
-       int iflag;
-       struct timer_event *ev, *node;
-       struct timer_event dummy;
-
-       iflag = get_intr_flag();
-       disable_intr();
-
-       dummy.next = evlist;
-       node = &dummy;
-       while(node->next) {
-               ev = node->next;
-               if(ev->func == func) {
-                       /* found it */
-                       if(ev->next) {
-                               ev->next->dt += ev->dt;
-                       }
-                       node->next = ev->next;
-                       free(ev);
-                       break;
-               }
-               node = node->next;
-       }
-
-       set_intr_flag(iflag);
-}
-
-static void timer_handler(int inum)
-{
-       nticks++;
-
-       if(evlist) {
-               evlist->dt--;
-
-               while(evlist && evlist->dt <= 0) {
-                       struct timer_event *ev = evlist;
-                       evlist = evlist->next;
-
-                       ev->func();
-                       free(ev);
-               }
-       }
-}