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Fixes to NVRAM initialization and the IBM AT's NVRAM now initializes with all 0xFF's.

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This commit is contained in:
OBattler
2018-10-06 01:48:21 +02:00
parent 02108238bd
commit 4a981119fa
3 changed files with 43 additions and 12 deletions
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18
src/machine/m_at.c
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@@ -8,7 +8,7 @@
*
* Standard PC/AT implementation.
*
* Version: @(#)m_at.c 1.0.0 2018/09/02
* Version: @(#)m_at.c 1.0.10 2018/10/06
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
@@ -87,7 +87,21 @@ machine_at_init(const machine_t *model)
void
machine_at_ibm_init(const machine_t *model)
{
machine_at_init(model);
machine_common_init(model);
pit_set_out_func(&pit, 1, pit_refresh_timer_at);
pic2_init();
dma16_init();
if (lpt_enabled)
lpt2_remove();
device_add(&ibmat_nvr_device);
if (joystick_type != 7)
device_add(&gameport_device);
device_add(&keyboard_at_device);
mem_remap_top(384);

3
src/nvr.h
View File

@@ -8,7 +8,7 @@
*
* Definitions for the generic NVRAM/CMOS driver.
*
* Version: @(#)nvr.h 1.0.9 2018/09/15
* Version: @(#)nvr.h 1.0.10 2018/10/06
*
* Author: Fred N. van Kempen, <decwiz@yahoo.com>,
* David Hrdlička, <hrdlickadavid@outlook.com>
@@ -92,6 +92,7 @@ extern const device_t at_nvr_old_device;
extern const device_t at_nvr_device;
extern const device_t ps_nvr_device;
extern const device_t amstrad_nvr_device;
extern const device_t ibmat_nvr_device;
#endif

34
src/nvr_at.c
View File

@@ -189,7 +189,7 @@
* including the later update (DS12887A) which implemented a
* "century" register to be compatible with Y2K.
*
* Version: @(#)nvr_at.c 1.0.12 2018/09/15
* Version: @(#)nvr_at.c 1.0.13 2018/10/06
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
@@ -286,9 +286,11 @@
typedef struct {
int8_t stat;
uint8_t cent;
uint16_t addr;
uint8_t cent;
uint8_t def;
uint8_t addr;
int64_t ecount,
rtctime;
@@ -614,7 +616,8 @@ nvr_reset(nvr_t *nvr)
{
local_t *local = (local_t *)nvr->data;
memset(nvr->regs, 0x00, RTC_REGS);
/* memset(nvr->regs, local->def, RTC_REGS); */
memset(nvr->regs, local->def, nvr->size);
nvr->regs[RTC_DOM] = 1;
nvr->regs[RTC_MONTH] = 1;
nvr->regs[RTC_YEAR] = RTC_BCD(80);
@@ -663,11 +666,6 @@ nvr_at_init(const device_t *info)
/* Allocate an NVR for this machine. */
nvr = (nvr_t *)malloc(sizeof(nvr_t));
if (nvr == NULL) return(NULL);
/* FIXME: See which is correct, this or 0xFF. */
if (info->local == 0)
memset(nvr, 0xff, sizeof(nvr_t));
else
memset(nvr, 0x00, sizeof(nvr_t));
local = (local_t *)malloc(sizeof(local_t));
memset(local, 0x00, sizeof(local_t));
@@ -675,6 +673,7 @@ nvr_at_init(const device_t *info)
/* This is machine specific. */
nvr->size = machines[machine].nvrmask + 1;
local->def = 0x00;
switch(info->local) {
case 0: /* standard AT, no century register */
nvr->irq = 8;
@@ -694,7 +693,15 @@ nvr_at_init(const device_t *info)
case 3: /* Amstrad PC's */
nvr->irq = 1;
local->cent = RTC_CENTURY_AT;
local->def = 0xff;
break;
case 4: /* IBM AT */
nvr->irq = 8;
local->cent = RTC_CENTURY_AT;
local->def = 0xff;
break;
}
/* Set up any local handlers here. */
@@ -768,3 +775,12 @@ const device_t amstrad_nvr_device = {
NULL, NULL,
NULL
};
const device_t ibmat_nvr_device = {
"IBM AT NVRAM",
DEVICE_ISA | DEVICE_AT,
4,
nvr_at_init, nvr_at_close, NULL,
NULL, NULL,
NULL
};