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Add a pretty bare bones implementation of APM 1.1 that can turn on an…
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…d off the power supply and grahics card. This implementation would also query battery life but I don't have anything to test it on.
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@joshudson
joshudson committed Mar 5, 2024
1 parent 1dcc99d commit 2362433
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66 changes: 63 additions & 3 deletions 8086tiny.c
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,7 @@
#ifndef GRAPHICS_UPDATE_DELAY
#define GRAPHICS_UPDATE_DELAY 360000
#endif
#define APM_INST_DELAY 1000
#define KEYBOARD_TIMER_UPDATE_DELAY 20000
#define HALT_TIME_MICROSECONDS 100
#define KEYBOARD_TIMER_DELAY_FROM_HALT 1000
Expand Down Expand Up @@ -205,11 +206,14 @@ unsigned char mem[RAM_SIZE + 16], io_ports[IO_PORT_COUNT + 16],
hlt_this_time, setting_ss, prior_setting_ss, reset_ip_after_rep_trace,
shift_count;
unsigned short *regs16, reg_ip, seg_override, file_index, wave_counter, reg_ip_before_rep_trace;
unsigned int op_source, op_dest, rm_addr, op_to_addr, op_from_addr, i_data0, i_data1, i_data2, scratch_uint, scratch2_uint, keyboard_timer_inst_counter, graphics_inst_counter, set_flags_type, GRAPHICS_X, GRAPHICS_Y, pixel_colors[16], vmem_ctr;
int op_result, disk[3], scratch_int;
unsigned int op_source, op_dest, rm_addr, op_to_addr, op_from_addr, i_data0, i_data1, i_data2, scratch_uint, scratch2_uint, keyboard_timer_inst_counter, graphics_inst_counter, apm_inst_counter, set_flags_type, GRAPHICS_X, GRAPHICS_Y, pixel_colors[16], vmem_ctr;
int op_result, disk[3], scratch_int, device_status;
time_t clock_buf;
struct timeb ms_clock;

#define DEVICE_STATUS_GRAPHICS 1
#define DEVICE_STATUS_FASTCPU 2

#ifndef NO_GRAPHICS
SDL_AudioSpec sdl_audio = {44100, AUDIO_U8, 1, 0, 128};
SDL_Surface *sdl_screen;
Expand All @@ -220,6 +224,7 @@ unsigned short vid_addr_lookup[VIDEO_RAM_SIZE], cga_colors[4] = {0 /* Black */,
// Helper functions

void callxms();
void callapm();

// Set carry flag
char set_CF(int new_CF)
Expand Down Expand Up @@ -848,6 +853,8 @@ int main(int argc, char **argv)
: (errno == EINVAL) ? 0x04 /* out of range on disk device */ : 0xAA /* no disk */;
OPCODE 4: // XMS
callxms();
OPCODE 5:
callapm();
}
if ((uint8_t)i_data0 == 11 // ud2
|| (uint8_t)i_data0 >= 32)
Expand Down Expand Up @@ -1023,7 +1030,7 @@ int main(int argc, char **argv)
graphics_inst_counter = 0;
hlt_this_time = 0;
// Video card in graphics mode?
if (io_ports[0x3B8] & 2)
if (io_ports[0x3B8] & 2 && device_status & DEVICE_STATUS_GRAPHICS)
{
// If we don't already have an SDL window open, set it up and compute color and video memory translation tables
if (!sdl_screen)
Expand Down Expand Up @@ -1057,6 +1064,11 @@ int main(int argc, char **argv)
SDL_PumpEvents();
}
#endif
if (!setting_ss && !hlt_this_time && !(device_status & DEVICE_STATUS_FASTCPU) && ++apm_inst_counter >= APM_INST_DELAY) {
hlt_this_time = 1;
apm_inst_counter = 0;
}

if (hlt_this_time) {
struct timespec ts;
ts.tv_sec = 0;
Expand Down Expand Up @@ -1240,6 +1252,54 @@ uint32_t getfreexms() {
return lower;
}

void callapm() {
char buf[12];
int h, tmp;
switch (regs8[REG_AH]) {
OPCODE_CHAIN 0: // CPU slow
device_status &= ~DEVICE_STATUS_FASTCPU;
OPCODE 1: // CPU normal
device_status |= DEVICE_STATUS_FASTCPU;
OPCODE 2: // graphics card off
device_status &= ~DEVICE_STATUS_GRAPHICS;
OPCODE 3: // graphics card on
device_status |= DEVICE_STATUS_GRAPHICS;
OPCODE 4: // Get battery status
#ifdef _WIN32
regs8[REG_BL] = 0xff;
#else
h = open("/sys/class/power_supply/BAT0/status", O_RDONLY);
if (h >= 0 && (0 < read(h, buf, 12)))
regs8[REG_BL] = buf[0] == 'C' ? 3 /* charging */ : 2 /* critical */;
else
regs8[REG_BL] = 0xFF; // Unable
if (h >= 0) close(h);
h = open("/sys/class/power_supply/BAT0/capacity", O_RDONLY);
if (h >= 0 && ((tmp = read(h, buf, 10)) > 0))
buf[tmp] = 0, regs8[REG_CL] = atoi(buf);
else
regs8[REG_CL] = 0xFF; // Unable
if (h >= 0) close(h);
if (regs8[REG_CL] != 0xFF && regs8[REG_BL] == 2) {
if (regs8[REG_CL] >= 50) regs8[REG_BL] = 0; // High
else if (regs8[REG_CL] >= 10) regs8[REG_BL] = 1; // Low
// If we can't get battery charge and we're not charging it's critical
}
#endif
OPCODE 5: // Get AC status
#ifdef _WIN32
regs8[REG_BH] = 0xff;
#else
h = open("/sys/class/power_supply/AC/online", O_RDONLY);
if (h >= 0 && (0 < read(h, buf, 2)))
regs8[REG_BH] = buf[0] - 1; // 0 = offline, 1 = online
else
regs8[REG_BH] = 0xFF; // Unable
if (h >= 0) close(h);
#endif
}
}


void callxms() {
uint32_t ii, free;
Expand Down
227 changes: 226 additions & 1 deletion bios.asm
View file
Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,15 @@ bios_entry:

; Now we can do whatever we want! DL starts off being the boot disk.

cmp byte [cs:boot_state], 0
jne .warm_early_boot
mov [cs:boot_device], dl
.warm_early_boot:
mov [cs:apm_flags], byte 0

; Set CPU to high power
mov ah, 1
db 0x0f, 0x05

; Set up Hercules graphics support. We start with the adapter in text mode

Expand All @@ -111,6 +119,10 @@ bios_entry:
mov al, 0x57 ; 0x57 = 87 (* 4) = 348 pixels high (GRAPHICS_Y)
out dx, al

; Graphics power on
mov ah, 3
db 0x0f, 0x05

pop dx

pop ax
Expand Down Expand Up @@ -2610,6 +2622,8 @@ int15: ; Here we do not support any of the functions, and just return
; je int15_intercept
cmp ah, 0x88
je int15_getextmem
cmp ah, 0x53
je int15_apm

; Otherwise, function not supported

Expand Down Expand Up @@ -2643,10 +2657,218 @@ int15_getextmem:
db 0Fh, 04h ; call into XMS interface
cmc ; if it returned NC, it means error
jnc .ret ; no error -->
mov ah, 86h
; No XMS interface but high memory exists
mov ax, 64
clc
.ret:
jmp reach_stack_carry

int15_apmversion:
cmp cx, 0x101
ja .nope
mov ax, 0x101
jmp reach_stack_clc
.nope mov ah, 0x0b
jmp reach_stack_stc

int15_apmbogonstate:
jmp reach_stack_clc

int15_apm:
cmp al, 0
je .apmchk
cmp al, 1
je .real
cmp al, 2
je .prot16
cmp al, 3
je .prot32
cmp al, 4
je .realdc
cmp al, 5
je .cpuidle
cmp al, 6
je .cpubusy
cmp al, 7
je .setpower
cmp al, 8
je .ends
cmp al, 9
je .ends
cmp al, 10
je .getbattery
cmp al, 11
je .getevent
cmp al, 12
je .getpower
cmp al, 13
je int15_apmbogonstate
cmp al, 14
je int15_apmversion
mov ah, 0ah
jmp .fail

.prot16: ; 16 bit protected mode, but we're an 8086
mov ah, 6
jmp .fail
.prot32: ; 32 bit protected mode, lolno
mov ah, 8
.fail jmp reach_stack_stc
.apmchk:
mov ax, 0x101
mov bx, 'PM'
mov cx, 4
.ok jmp reach_stack_clc

.realdc: ; Real mode APM disconnect
test [cs:apm_flags], byte 1
jz .notconnected
mov [cs:apm_flags], byte 0
mov ah, 1 ; Take CPU out of idle
db 0x0f, 0x05
jmp reach_stack_clc
.notconnected:
mov ah, 0x03
jmp .fail

.real: ; Real mode connect -- neither of these do anything interesting
; Suspend would turn off the mouse; so we can't easily implement a good idle policy
test [cs:apm_flags], byte 1
jnz .realalready
or bx, bx
jnz .fail
mov [cs:apm_flags], byte 1
jmp .ok
.realalready:
mov ah, 0x02
jmp .fail

.cpuidle:
test [cs:apm_flags], byte 1
jz .notconnected
push ax
mov ah, 0
db 0x0f, 0x05
pop ax
jmp .ok

.cpubusy: ; Documentation says bios should be able to tell; this bios can't
; However this bios can only slow on cpuidle so it's all right
test [cs:apm_flags], byte 1
jz .notconnected
push ax
mov ah, 1
db 0x0f, 0x05
pop ax
jmp .ok

.ends: ; Enable/disable is NOP
test [cs:apm_flags], byte 1
jz .notconnected
cmp bx, 0xffff
je .ok
jmp .fail

.setpower:
test [cs:apm_flags], byte 1
jz .notconnected
cmp cx, 3
ja .nos
je .cxk
cmp cx, 0
jne .nxs
.cxk cmp bx, 1
je .system
cmp bx, 0x100
je .graphics
.nodevice:
mov ah, 9
jmp .fail
.nos mov ah, 0x0a
jmp .fail
.nxs mov ah, 0x60
jmp .fail

.system cmp cx, 3
je .poweroff
jmp .ok
.graphics:
push ax
mov ah, 3
cmp cx, 3
and [cs:apm_flags], byte 0xfb
je .graphicsoff
mov ah, 2
or [cs:apm_flags], byte 4
.graphicsoff:
db 0x0f, 0x05
pop ax
jmp .ok

.poweroff: ; Turn off the system
mov bx, bp ; Get error code from caller, if any
mov ax, dx
jmp 0:0

.getpower:
cmp bx, 0x100
je .getgraphics
cmp bx, 1 ; System
jne .nodevice
mov cx, 1
jmp .ok
.getgraphics:
xor cx, cx
test [cs:apm_flags], byte 4
jz .getgraphicson
mov cl, 3
.getgraphicson:
jmp .ok

.getbattery:
cmp bx, 1
ja .nodevice ; asks for specific battery; but we are APM 1.1
push ax
; This call always succeeds
mov ah, 4
db 0x0f, 0x05
mov ah, 5
db 0x0f, 0x05
pop ax
jmp reach_stack_clc

.getevent:
; There's only one event: battery
test [cs:apm_flags], byte 1
jz .notconnected
push bp
mov bp, sp
push ax
push bx
push cx
mov ah, 4
db 0x0f, 0x05
cmp bl, 2
jne .gennocrit
test [cs:apm_flags], byte 2
jz .gencritalready
or [cs:apm_flags], byte 2
; I hate this specification. What is labelled as low battery notification is critical battery notification and
; what is labelled as critical battery notification is critical batter after waking from unscheduled suspend. -JH
mov [bp - 4], word 5 ; AX = battery notification
clc
jmp .geexit
.gennocrit:
and [cs:apm_flags], byte 0xfd
.gencritalready:
mov [bp - 1], byte 80h ; AH = no event
stc
.geexit:
pop cx
pop bx
pop ax
pop bp
jmp reach_stack_carry

; ************************* INT 16h handler - keyboard

Expand Down Expand Up @@ -4050,6 +4272,9 @@ crt_curpos_y_last db 0
last_int8_msec dw 0
last_key_sdl db 0

; APM data
apm_flags db 0

; Now follow the tables for instruction decode helping

align 8
Expand Down
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