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shoebill
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Added a hook for shutdown 

To which the Macintosh II usually responds by powering off
This commit is contained in:
pruten 2014-09-22 17:02:17 -04:00
parent b29c69453e
commit a0810f55b9
1 changed files with 27 additions and 3 deletions
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30
core/via.c
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@ -31,6 +31,7 @@
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include "../core/shoebill.h"
char *via_reg_str[16] = {
@ -471,15 +472,21 @@ void init_via_state (uint8_t pram_data[256], shoebill_pram_callback_t callback,
* Bit 5 - input - v2TM0A (nubus transfer what??)
* Bit 4 - input - v2TM1A
* Bit 3 - output - AMU/PMMU control
* Bit 2 - output - v2PowerOff
* Bit 2 - output - v2PowerOff (but leave this in input mode)
* Bit 1 - output - v2BusLk
* Bit 0 - output - v2cdis
*/
shoe.via[1].ddrb = ~b(10001111);
shoe.via[1].ddrb = 0x00;
shoe.via[1].ddrb = ~b(10001011);
// FIXME: apparently via2/regb bit 7 is tied to VIA1, and driven by timer T1, to
// generate 60.15hz (really 60.0hz) interrupts on VIA1
// emulate this more accurately!
// The power unit is wired to bit 2, waiting for it to be set 0.
// I guess we're supposed to leave it as an input, because the shutdown
// routine first sets the bit to 0, *then* switches the direction to output.
// FIXME: verify that this is correct
/* -- Initialize PRAM -- */
pram_state_t *pram = &shoe.pram;
@ -498,6 +505,7 @@ void init_via_state (uint8_t pram_data[256], shoebill_pram_callback_t callback,
}
#define E_CLOCK 783360
#define V2POWEROFF_MASK 0x04
#define _via_get_delta_counter(last_set) ({ \
const long double delta_t = now - (last_set); \
@ -514,6 +522,12 @@ void init_via_state (uint8_t pram_data[256], shoebill_pram_callback_t callback,
#define VIA_REGB_PINS(n) ((shoe.via[(n)-1].regb_output & shoe.via[(n)-1].ddrb) | \
(shoe.via[(n)-1].regb_input & (~~shoe.via[(n)-1].ddrb)))
static void _via_poweroff(void)
{
slog("Poweroff!\n");
// exit(0);
}
static uint8_t via_read_reg(const uint8_t vianum, const uint8_t reg, const long double now)
{
via_state_t *via = &shoe.via[vianum - 1];
@ -641,6 +655,11 @@ static void via_write_reg(const uint8_t vianum, const uint8_t reg, const uint8_t
handle_pram_state_change();
}
if ((vianum == 2) &&
(via->ddrb & V2POWEROFF_MASK) &&
!(via->regb_output & V2POWEROFF_MASK))
_via_poweroff();
break;
}
@ -652,9 +671,14 @@ static void via_write_reg(const uint8_t vianum, const uint8_t reg, const uint8_t
break;
}
case VIA_DDRB:
case VIA_DDRB: {
via->ddrb = data;
if ((vianum == 2) &&
(via->ddrb & V2POWEROFF_MASK) &&
!(via->regb_output & V2POWEROFF_MASK))
_via_poweroff();
break;
}
case VIA_DDRA:
via->ddra = data;