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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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41
src/emu/kernel/event.c
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@ -3,38 +3,24 @@
#include "kernel_priv.h" #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 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 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) { switch (emu->ev->v) {
return chan_push(ch, value_int64(st)); case 'O':
} else if (action == POP) { return chan_push(ch, value_int64(ST_CSOUT));
return chan_pop(ch, value_int64(st)); case 'I':
} else if (action == IGN) { return chan_pop(ch, value_int64(ST_CSOUT));
return 0; /* do nothing */ default:
} else { err("unknown context switch event");
err("unknown event"); return -1;
return -1;
} }
return 0; /* Not reached */
return -1;
} }
static int static int
@ -42,7 +28,7 @@ process_ev(struct emu *emu)
{ {
switch (emu->ev->c) { switch (emu->ev->c) {
case 'C': case 'C':
return simple(emu); return context_switch(emu);
default: default:
err("unknown Kernel event category"); err("unknown Kernel event category");
return -1; return -1;
@ -65,7 +51,6 @@ model_kernel_event(struct emu *emu)
enabled = 1; enabled = 1;
} }
dbg("in kernel_event"); dbg("in kernel_event");
if (emu->ev->m != 'K') { if (emu->ev->m != 'K') {
err("unexpected event model %c\n", emu->ev->m); err("unexpected event model %c\n", emu->ev->m);