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Rework DBDMA logic for bidirectional channels.

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This commit is contained in:
Maxim Poliakovski 2022-10-20 13:20:06 +02:00
parent 98ccef732f
commit 9f4c248e4c
7 changed files with 112 additions and 65 deletions
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7
cpu/ppc/ppcmmu.cpp
View File

@ -309,9 +309,11 @@ static PATResult page_address_translation(uint32_t la, bool is_instr_fetch,
};
}
uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size)
uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size, bool* is_writable)
{
if (addr >= last_dma_area.start && (addr + size) <= last_dma_area.end) {
if (is_writable)
*is_writable = last_dma_area.type & RT_RAM;
return last_dma_area.mem_ptr + (addr - last_dma_area.start);
} else {
AddressMapEntry* entry = mem_ctrl_instance->find_range(addr);
@ -319,6 +321,9 @@ uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size)
last_dma_area.start = entry->start;
last_dma_area.end = entry->end;
last_dma_area.mem_ptr = entry->mem_ptr;
last_dma_area.type = entry->type;
if (is_writable)
*is_writable = entry->type & RT_RAM;
return last_dma_area.mem_ptr + (addr - last_dma_area.start);
} else {
ABORT_F("SOS: DMA access to unmapped memory %08X!\n", addr);

2
cpu/ppc/ppcmmu.h
View File

@ -102,7 +102,7 @@ enum TLBFlags : uint16_t {
extern std::function<void(uint32_t bat_reg)> ibat_update;
extern std::function<void(uint32_t bat_reg)> dbat_update;
extern uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size);
extern uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size, bool* is_writable);
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();

113
devices/common/dbdma.cpp
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -25,6 +25,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <devices/common/dbdma.h>
#include <devices/common/dmacore.h>
#include <endianswap.h>
#include <memaccess.h>
#include <cinttypes>
#include <cstring>
@ -36,21 +37,51 @@ void DMAChannel::set_callbacks(DbdmaCallback start_cb, DbdmaCallback stop_cb)
this->stop_cb = stop_cb;
}
void DMAChannel::get_next_cmd(uint32_t cmd_addr, DMACmd* p_cmd) {
void DMAChannel::fetch_cmd(uint32_t cmd_addr, DMACmd* p_cmd) {
/* load DMACmd from physical memory */
memcpy((uint8_t*)p_cmd, mmu_get_dma_mem(cmd_addr, 16), 16);
memcpy((uint8_t*)p_cmd, mmu_get_dma_mem(cmd_addr, 16, nullptr), 16);
}
uint8_t DMAChannel::interpret_cmd() {
DMACmd cmd_struct;
bool is_writable;
int cmd;
get_next_cmd(this->cmd_ptr, &cmd_struct);
if (this->cmd_in_progress) {
// return current command if there is data to transfer
if (this->queue_len)
return cmd;
// obtain real pointer to the descriptor of the completed command
uint8_t *curr_cmd = mmu_get_dma_mem(this->cmd_ptr - 16, 16, &is_writable);
// get command code
cmd = curr_cmd[3] >> 4;
// all commands except STOP update cmd.xferStatus
if (cmd < 7 && is_writable) {
WRITE_WORD_LE_A(&curr_cmd[14], this->ch_stat | CH_STAT_ACTIVE);
}
// all INPUT and OUTPUT commands update cmd.resCount
if (cmd < 4 && is_writable) {
WRITE_WORD_LE_A(&curr_cmd[12], this->queue_len & 0xFFFFUL);
}
this->cmd_in_progress = false;
}
fetch_cmd(this->cmd_ptr, &cmd_struct);
cmd = cmd_struct.cmd_key >> 4;
this->ch_stat &= ~CH_STAT_WAKE; /* clear wake bit (DMA spec, 5.5.3.4) */
switch (cmd_struct.cmd_key >> 4) {
case 0:
LOG_F(9, "Executing DMA Command OUTPUT_MORE");
case 0: // OUTPUT_MORE
case 1: // OUTPUT_LAST
case 2: // INPUT_MORE
case 3: // INPUT_LAST
if (cmd_struct.cmd_key & 7) {
LOG_F(ERROR, "Key > 0 not implemented");
break;
@ -59,35 +90,10 @@ uint8_t DMAChannel::interpret_cmd() {
LOG_F(ERROR, "non-zero i/b/w not implemented");
break;
}
// this->dma_cb->dma_push(
// mmu_get_dma_mem(cmd_struct.address, cmd_struct.req_count),
// cmd_struct.req_count);
this->queue_data = mmu_get_dma_mem(cmd_struct.address, cmd_struct.req_count);
this->queue_data = mmu_get_dma_mem(cmd_struct.address, cmd_struct.req_count, &is_writable);
this->queue_len = cmd_struct.req_count;
this->cmd_ptr += 16;
break;
case 1:
LOG_F(9, "Executing DMA Command OUTPUT_LAST");
if (cmd_struct.cmd_key & 7) {
LOG_F(ERROR, "Key > 0 not implemented");
break;
}
if (cmd_struct.cmd_bits & 0x3F) {
LOG_F(ERROR, "non-zero i/b/w not implemented");
break;
}
// this->dma_cb->dma_push(
// mmu_get_dma_mem(cmd_struct.address, cmd_struct.req_count),
// cmd_struct.req_count);
this->queue_data = mmu_get_dma_mem(cmd_struct.address, cmd_struct.req_count);
this->queue_len = cmd_struct.req_count;
this->cmd_ptr += 16;
break;
case 2:
LOG_F(ERROR, "Unsupported DMA Command INPUT_MORE");
break;
case 3:
LOG_F(ERROR, "Unsupported DMA Command INPUT_LAST");
this->cmd_in_progress = true;
break;
case 4:
LOG_F(ERROR, "Unsupported DMA Command STORE_QUAD");
@ -96,11 +102,11 @@ uint8_t DMAChannel::interpret_cmd() {
LOG_F(ERROR, "Unsupported DMA Command LOAD_QUAD");
break;
case 6:
LOG_F(INFO, "Unsupported DMA Command NOP");
LOG_F(ERROR, "Unsupported DMA Command NOP");
break;
case 7:
LOG_F(INFO, "DMA Command: 7 (STOP)");
this->ch_stat &= ~CH_STAT_ACTIVE;
this->cmd_in_progress = false;
break;
default:
LOG_F(ERROR, "Unsupported DMA command 0x%X", cmd_struct.cmd_key >> 4);
@ -149,7 +155,7 @@ void DMAChannel::reg_write(uint32_t offset, uint32_t value, int size) {
case DMAReg::CH_CTRL:
mask = value >> 16;
new_stat = (value & mask & 0xF0FFU) | (old_stat & ~mask);
LOG_F(INFO, "New ChannelStatus value = 0x%X", new_stat);
LOG_F(9, "New ChannelStatus value = 0x%X", new_stat);
if ((new_stat & CH_STAT_RUN) != (old_stat & CH_STAT_RUN)) {
if (new_stat & CH_STAT_RUN) {
@ -184,7 +190,7 @@ void DMAChannel::reg_write(uint32_t offset, uint32_t value, int size) {
case DMAReg::CMD_PTR_LO:
if (!(this->ch_stat & CH_STAT_RUN) && !(this->ch_stat & CH_STAT_ACTIVE)) {
this->cmd_ptr = value;
LOG_F(INFO, "CommandPtrLo set to 0x%X", this->cmd_ptr);
LOG_F(9, "CommandPtrLo set to 0x%X", this->cmd_ptr);
}
break;
default:
@ -227,6 +233,33 @@ DmaPullResult DMAChannel::pull_data(uint32_t req_len, uint32_t *avail_len, uint8
return DmaPullResult::NoMoreData; /* tell the caller there is no more data */
}
int DMAChannel::push_data(const char* src_ptr, int len)
{
if (this->ch_stat & CH_STAT_DEAD || !(this->ch_stat & CH_STAT_ACTIVE)) {
LOG_F(WARNING, "DBDMA: attempt to push data to dead/idle channel");
return -1;
}
// interpret DBDMA program until we get buffer to fill in or become idle
while ((this->ch_stat & CH_STAT_ACTIVE) && !this->queue_len) {
this->interpret_cmd();
}
if (this->queue_len) {
len = std::min((int)this->queue_len, len);
std::memcpy(this->queue_data, src_ptr, len);
this->queue_data += len;
this->queue_len -= len;
}
// proceed with the DBDMA program if the buffer became exhausted
if (!this->queue_len) {
this->interpret_cmd();
}
return 0;
}
bool DMAChannel::is_active()
{
if (this->ch_stat & CH_STAT_DEAD || !(this->ch_stat & CH_STAT_ACTIVE)) {
@ -248,7 +281,8 @@ void DMAChannel::start()
this->queue_len = 0;
this->start_cb();
if (this->start_cb)
this->start_cb();
}
void DMAChannel::resume() {
@ -266,5 +300,6 @@ void DMAChannel::abort() {
void DMAChannel::pause() {
LOG_F(INFO, "Pausing DMA channel");
this->stop_cb();
if (this->stop_cb)
this->stop_cb();
}

32
devices/common/dbdma.h
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -42,7 +42,7 @@ enum DMAReg : uint32_t {
};
/** Channel Status bits (DBDMA spec, 5.5.3) */
enum {
enum : uint16_t {
CH_STAT_ACTIVE = 0x400,
CH_STAT_DEAD = 0x800,
CH_STAT_WAKE = 0x1000,
@ -53,18 +53,18 @@ enum {
/** DBDMA command (DBDMA spec, 5.6.1) - all fields are little-endian! */
typedef struct DMACmd {
uint16_t req_count;
uint8_t cmd_bits;
uint8_t cmd_key;
uint32_t address;
uint32_t cmd_arg;
uint16_t res_count;
uint16_t xfer_stat;
uint16_t req_count;
uint8_t cmd_bits;
uint8_t cmd_key;
uint32_t address;
uint32_t cmd_arg;
uint16_t res_count;
uint16_t xfer_stat;
} DMACmd;
typedef std::function<void(void)> DbdmaCallback;
class DMAChannel : public DmaOutChannel {
class DMAChannel : public DmaBidirChannel {
public:
DMAChannel() = default;
~DMAChannel() = default;
@ -75,9 +75,10 @@ public:
bool is_active();
DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len, uint8_t **p_data);
int push_data(const char* src_ptr, int len);
protected:
void get_next_cmd(uint32_t cmd_addr, DMACmd* p_cmd);
void fetch_cmd(uint32_t cmd_addr, DMACmd* p_cmd);
uint8_t interpret_cmd(void);
void start(void);
@ -86,14 +87,15 @@ protected:
void pause(void);
private:
std::function<void(void)> start_cb; // DMA channel start callback
std::function<void(void)> stop_cb; // DMA channel stop callback
std::function<void(void)> start_cb = nullptr; // DMA channel start callback
std::function<void(void)> stop_cb = nullptr; // DMA channel stop callback
uint16_t ch_stat = 0;
uint32_t cmd_ptr = 0;
uint32_t queue_len = 0;
uint8_t* queue_data = 0;
uint32_t queue_len;
uint8_t* queue_data;
bool cmd_in_progress = false;
};
#endif /* DB_DMA_H */

12
devices/common/dmacore.h
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -38,13 +38,13 @@ public:
uint8_t **p_data) = 0;
};
// Base class for bidirectional DMA channels.
class DmaBidirChannel {
class DmaInChannel {
public:
virtual bool is_active() { return true; };
virtual int push_data(const char* src_ptr, int len) = 0;
virtual DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data) = 0;
};
// Base class for bidirectional DMA channels.
class DmaBidirChannel : public DmaOutChannel, public DmaInChannel {
};
#endif // DMA_CORE_H

9
devices/ioctrl/amic.cpp
View File

@ -491,7 +491,7 @@ DmaPullResult AmicSndOutDma::pull_data(uint32_t req_len, uint32_t *avail_len,
*p_data = mmu_get_dma_mem(
(this->snd_buf_num ? this->out_buf1 : this->out_buf0) + this->cur_buf_pos,
len);
len, nullptr);
this->cur_buf_pos += len;
*avail_len = len;
return DmaPullResult::MoreData;
@ -524,9 +524,14 @@ void AmicFloppyDma::write_ctrl(uint8_t value)
int AmicFloppyDma::push_data(const char* src_ptr, int len)
{
bool is_writable;
len = std::min((int)this->byte_count, len);
uint8_t *p_data = mmu_get_dma_mem(this->addr_ptr, len);
uint8_t *p_data = mmu_get_dma_mem(this->addr_ptr, len, &is_writable);
if (!is_writable) {
ABORT_F("AMIC: attempting DMA write to read-only memory");
}
std::memcpy(p_data, src_ptr, len);
this->addr_ptr += len;

2
devices/video/pdmonboard.cpp
View File

@ -204,7 +204,7 @@ void PdmOnboardVideo::enable_video_internal()
LOG_F(INFO, "PDM-Video: framebuffer phys base addr = 0x%X", fb_base_phys);
// set framebuffer address and pitch
this->fb_ptr = mmu_get_dma_mem(fb_base_phys, PDM_FB_SIZE_MAX);
this->fb_ptr = mmu_get_dma_mem(fb_base_phys, PDM_FB_SIZE_MAX, nullptr);
this->active_width = new_width;
this->active_height = new_height;