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Simplify context switch logic

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Rodrigo Arias 2023-03-21 10:24:43 +01:00 committed by Rodrigo Arias Mallo
parent 74f253b575
commit 5556c521a0
1 changed files with 13 additions and 28 deletions
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39
src/emu/kernel/event.c
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@ -3,38 +3,24 @@
#include "kernel_priv.h"
enum { PUSH = 1, POP = 2, IGN = 3 };
static const int ss_table[256][256][3] = {
['C'] = {
['O'] = { CH_CS, PUSH, ST_CSOUT },
['I'] = { CH_CS, POP, ST_CSOUT },
},
};
static int
simple(struct emu *emu)
context_switch(struct emu *emu)
{
const int *entry = ss_table[emu->ev->c][emu->ev->v];
int chind = entry[0];
int action = entry[1];
int st = entry[2];
struct kernel_thread *th = EXT(emu->thread, 'K');
struct chan *ch = &th->m.ch[chind];
struct chan *ch = &th->m.ch[CH_CS];
if (action == PUSH) {
return chan_push(ch, value_int64(st));
} else if (action == POP) {
return chan_pop(ch, value_int64(st));
} else if (action == IGN) {
return 0; /* do nothing */
} else {
err("unknown event");
switch (emu->ev->v) {
case 'O':
return chan_push(ch, value_int64(ST_CSOUT));
case 'I':
return chan_pop(ch, value_int64(ST_CSOUT));
default:
err("unknown context switch event");
return -1;
}
return 0;
/* Not reached */
return -1;
}
static int
@ -42,7 +28,7 @@ process_ev(struct emu *emu)
{
switch (emu->ev->c) {
case 'C':
return simple(emu);
return context_switch(emu);
default:
err("unknown Kernel event category");
return -1;
@ -65,7 +51,6 @@ model_kernel_event(struct emu *emu)
enabled = 1;
}
dbg("in kernel_event");
if (emu->ev->m != 'K') {
err("unexpected event model %c\n", emu->ev->m);