mirror of https://gitee.com/openkylin/qemu.git
601 lines
15 KiB
C
601 lines
15 KiB
C
/*
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* QEMU DMA emulation
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*
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* Copyright (c) 2003-2004 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/hw.h"
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#include "hw/isa/isa.h"
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#include "qemu/main-loop.h"
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/* #define DEBUG_DMA */
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#define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#ifdef DEBUG_DMA
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#define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
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#else
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#define linfo(...)
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#define ldebug(...)
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#endif
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struct dma_regs {
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int now[2];
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uint16_t base[2];
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uint8_t mode;
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uint8_t page;
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uint8_t pageh;
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uint8_t dack;
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uint8_t eop;
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DMA_transfer_handler transfer_handler;
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void *opaque;
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};
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#define ADDR 0
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#define COUNT 1
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static struct dma_cont {
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uint8_t status;
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uint8_t command;
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uint8_t mask;
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uint8_t flip_flop;
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int dshift;
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struct dma_regs regs[4];
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qemu_irq *cpu_request_exit;
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MemoryRegion channel_io;
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MemoryRegion cont_io;
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} dma_controllers[2];
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enum {
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CMD_MEMORY_TO_MEMORY = 0x01,
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CMD_FIXED_ADDRESS = 0x02,
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CMD_BLOCK_CONTROLLER = 0x04,
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CMD_COMPRESSED_TIME = 0x08,
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CMD_CYCLIC_PRIORITY = 0x10,
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CMD_EXTENDED_WRITE = 0x20,
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CMD_LOW_DREQ = 0x40,
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CMD_LOW_DACK = 0x80,
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CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS
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| CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE
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| CMD_LOW_DREQ | CMD_LOW_DACK
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};
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static void DMA_run (void);
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static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};
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static void write_page (void *opaque, uint32_t nport, uint32_t data)
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{
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struct dma_cont *d = opaque;
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int ichan;
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ichan = channels[nport & 7];
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if (-1 == ichan) {
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dolog ("invalid channel %#x %#x\n", nport, data);
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return;
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}
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d->regs[ichan].page = data;
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}
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static void write_pageh (void *opaque, uint32_t nport, uint32_t data)
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{
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struct dma_cont *d = opaque;
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int ichan;
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ichan = channels[nport & 7];
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if (-1 == ichan) {
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dolog ("invalid channel %#x %#x\n", nport, data);
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return;
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}
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d->regs[ichan].pageh = data;
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}
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static uint32_t read_page (void *opaque, uint32_t nport)
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{
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struct dma_cont *d = opaque;
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int ichan;
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ichan = channels[nport & 7];
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if (-1 == ichan) {
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dolog ("invalid channel read %#x\n", nport);
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return 0;
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}
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return d->regs[ichan].page;
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}
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static uint32_t read_pageh (void *opaque, uint32_t nport)
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{
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struct dma_cont *d = opaque;
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int ichan;
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ichan = channels[nport & 7];
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if (-1 == ichan) {
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dolog ("invalid channel read %#x\n", nport);
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return 0;
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}
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return d->regs[ichan].pageh;
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}
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static inline void init_chan (struct dma_cont *d, int ichan)
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{
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struct dma_regs *r;
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r = d->regs + ichan;
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r->now[ADDR] = r->base[ADDR] << d->dshift;
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r->now[COUNT] = 0;
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}
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static inline int getff (struct dma_cont *d)
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{
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int ff;
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ff = d->flip_flop;
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d->flip_flop = !ff;
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return ff;
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}
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static uint64_t read_chan(void *opaque, hwaddr nport, unsigned size)
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{
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struct dma_cont *d = opaque;
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int ichan, nreg, iport, ff, val, dir;
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struct dma_regs *r;
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iport = (nport >> d->dshift) & 0x0f;
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ichan = iport >> 1;
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nreg = iport & 1;
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r = d->regs + ichan;
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dir = ((r->mode >> 5) & 1) ? -1 : 1;
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ff = getff (d);
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if (nreg)
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val = (r->base[COUNT] << d->dshift) - r->now[COUNT];
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else
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val = r->now[ADDR] + r->now[COUNT] * dir;
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ldebug ("read_chan %#x -> %d\n", iport, val);
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return (val >> (d->dshift + (ff << 3))) & 0xff;
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}
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static void write_chan(void *opaque, hwaddr nport, uint64_t data,
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unsigned size)
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{
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struct dma_cont *d = opaque;
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int iport, ichan, nreg;
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struct dma_regs *r;
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iport = (nport >> d->dshift) & 0x0f;
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ichan = iport >> 1;
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nreg = iport & 1;
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r = d->regs + ichan;
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if (getff (d)) {
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r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00);
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init_chan (d, ichan);
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} else {
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r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff);
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}
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}
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static void write_cont(void *opaque, hwaddr nport, uint64_t data,
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unsigned size)
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{
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struct dma_cont *d = opaque;
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int iport, ichan = 0;
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iport = (nport >> d->dshift) & 0x0f;
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switch (iport) {
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case 0x00: /* command */
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if ((data != 0) && (data & CMD_NOT_SUPPORTED)) {
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dolog("command %"PRIx64" not supported\n", data);
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return;
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}
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d->command = data;
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break;
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case 0x01:
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ichan = data & 3;
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if (data & 4) {
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d->status |= 1 << (ichan + 4);
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}
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else {
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d->status &= ~(1 << (ichan + 4));
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}
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d->status &= ~(1 << ichan);
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DMA_run();
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break;
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case 0x02: /* single mask */
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if (data & 4)
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d->mask |= 1 << (data & 3);
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else
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d->mask &= ~(1 << (data & 3));
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DMA_run();
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break;
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case 0x03: /* mode */
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{
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ichan = data & 3;
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#ifdef DEBUG_DMA
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{
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int op, ai, dir, opmode;
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op = (data >> 2) & 3;
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ai = (data >> 4) & 1;
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dir = (data >> 5) & 1;
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opmode = (data >> 6) & 3;
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linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
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ichan, op, ai, dir, opmode);
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}
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#endif
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d->regs[ichan].mode = data;
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break;
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}
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case 0x04: /* clear flip flop */
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d->flip_flop = 0;
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break;
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case 0x05: /* reset */
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d->flip_flop = 0;
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d->mask = ~0;
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d->status = 0;
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d->command = 0;
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break;
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case 0x06: /* clear mask for all channels */
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d->mask = 0;
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DMA_run();
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break;
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case 0x07: /* write mask for all channels */
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d->mask = data;
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DMA_run();
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break;
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default:
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dolog ("unknown iport %#x\n", iport);
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break;
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}
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#ifdef DEBUG_DMA
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if (0xc != iport) {
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linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n",
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nport, ichan, data);
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}
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#endif
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}
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static uint64_t read_cont(void *opaque, hwaddr nport, unsigned size)
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{
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struct dma_cont *d = opaque;
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int iport, val;
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iport = (nport >> d->dshift) & 0x0f;
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switch (iport) {
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case 0x00: /* status */
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val = d->status;
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d->status &= 0xf0;
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break;
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case 0x01: /* mask */
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val = d->mask;
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break;
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default:
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val = 0;
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break;
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}
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ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val);
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return val;
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}
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int DMA_get_channel_mode (int nchan)
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{
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return dma_controllers[nchan > 3].regs[nchan & 3].mode;
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}
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void DMA_hold_DREQ (int nchan)
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{
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int ncont, ichan;
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ncont = nchan > 3;
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ichan = nchan & 3;
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linfo ("held cont=%d chan=%d\n", ncont, ichan);
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dma_controllers[ncont].status |= 1 << (ichan + 4);
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DMA_run();
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}
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void DMA_release_DREQ (int nchan)
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{
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int ncont, ichan;
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ncont = nchan > 3;
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ichan = nchan & 3;
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linfo ("released cont=%d chan=%d\n", ncont, ichan);
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dma_controllers[ncont].status &= ~(1 << (ichan + 4));
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DMA_run();
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}
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static void channel_run (int ncont, int ichan)
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{
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int n;
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struct dma_regs *r = &dma_controllers[ncont].regs[ichan];
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#ifdef DEBUG_DMA
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int dir, opmode;
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dir = (r->mode >> 5) & 1;
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opmode = (r->mode >> 6) & 3;
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if (dir) {
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dolog ("DMA in address decrement mode\n");
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}
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if (opmode != 1) {
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dolog ("DMA not in single mode select %#x\n", opmode);
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}
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#endif
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n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
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r->now[COUNT], (r->base[COUNT] + 1) << ncont);
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r->now[COUNT] = n;
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ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont);
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}
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static QEMUBH *dma_bh;
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static void DMA_run (void)
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{
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struct dma_cont *d;
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int icont, ichan;
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int rearm = 0;
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static int running = 0;
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if (running) {
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rearm = 1;
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goto out;
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} else {
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running = 1;
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}
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d = dma_controllers;
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for (icont = 0; icont < 2; icont++, d++) {
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for (ichan = 0; ichan < 4; ichan++) {
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int mask;
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mask = 1 << ichan;
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if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) {
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channel_run (icont, ichan);
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rearm = 1;
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}
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}
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}
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running = 0;
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out:
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if (rearm)
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qemu_bh_schedule_idle(dma_bh);
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}
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static void DMA_run_bh(void *unused)
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{
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DMA_run();
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}
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void DMA_register_channel (int nchan,
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DMA_transfer_handler transfer_handler,
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void *opaque)
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{
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struct dma_regs *r;
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int ichan, ncont;
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ncont = nchan > 3;
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ichan = nchan & 3;
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r = dma_controllers[ncont].regs + ichan;
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r->transfer_handler = transfer_handler;
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r->opaque = opaque;
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}
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int DMA_read_memory (int nchan, void *buf, int pos, int len)
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{
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struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3];
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hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
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if (r->mode & 0x20) {
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int i;
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uint8_t *p = buf;
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cpu_physical_memory_read (addr - pos - len, buf, len);
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/* What about 16bit transfers? */
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for (i = 0; i < len >> 1; i++) {
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uint8_t b = p[len - i - 1];
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p[i] = b;
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}
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}
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else
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cpu_physical_memory_read (addr + pos, buf, len);
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return len;
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}
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int DMA_write_memory (int nchan, void *buf, int pos, int len)
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{
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struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3];
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hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
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if (r->mode & 0x20) {
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int i;
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uint8_t *p = buf;
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cpu_physical_memory_write (addr - pos - len, buf, len);
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/* What about 16bit transfers? */
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for (i = 0; i < len; i++) {
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uint8_t b = p[len - i - 1];
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p[i] = b;
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}
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}
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else
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cpu_physical_memory_write (addr + pos, buf, len);
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return len;
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}
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/* request the emulator to transfer a new DMA memory block ASAP */
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void DMA_schedule(int nchan)
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{
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struct dma_cont *d = &dma_controllers[nchan > 3];
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qemu_irq_pulse(*d->cpu_request_exit);
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}
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static void dma_reset(void *opaque)
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{
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struct dma_cont *d = opaque;
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write_cont(d, (0x05 << d->dshift), 0, 1);
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}
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static int dma_phony_handler (void *opaque, int nchan, int dma_pos, int dma_len)
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{
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dolog ("unregistered DMA channel used nchan=%d dma_pos=%d dma_len=%d\n",
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nchan, dma_pos, dma_len);
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return dma_pos;
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}
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static const MemoryRegionOps channel_io_ops = {
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.read = read_chan,
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.write = write_chan,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.impl = {
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.min_access_size = 1,
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.max_access_size = 1,
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},
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};
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/* IOport from page_base */
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static const MemoryRegionPortio page_portio_list[] = {
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{ 0x01, 3, 1, .write = write_page, .read = read_page, },
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{ 0x07, 1, 1, .write = write_page, .read = read_page, },
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PORTIO_END_OF_LIST(),
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};
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/* IOport from pageh_base */
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static const MemoryRegionPortio pageh_portio_list[] = {
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{ 0x01, 3, 1, .write = write_pageh, .read = read_pageh, },
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{ 0x07, 3, 1, .write = write_pageh, .read = read_pageh, },
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PORTIO_END_OF_LIST(),
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};
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static const MemoryRegionOps cont_io_ops = {
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.read = read_cont,
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.write = write_cont,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.impl = {
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.min_access_size = 1,
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.max_access_size = 1,
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},
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};
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/* dshift = 0: 8 bit DMA, 1 = 16 bit DMA */
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static void dma_init2(struct dma_cont *d, int base, int dshift,
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int page_base, int pageh_base,
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qemu_irq *cpu_request_exit)
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{
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int i;
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d->dshift = dshift;
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d->cpu_request_exit = cpu_request_exit;
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memory_region_init_io(&d->channel_io, NULL, &channel_io_ops, d,
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"dma-chan", 8 << d->dshift);
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memory_region_add_subregion(isa_address_space_io(NULL),
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base, &d->channel_io);
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isa_register_portio_list(NULL, page_base, page_portio_list, d,
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"dma-page");
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if (pageh_base >= 0) {
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isa_register_portio_list(NULL, pageh_base, pageh_portio_list, d,
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"dma-pageh");
|
|
}
|
|
|
|
memory_region_init_io(&d->cont_io, NULL, &cont_io_ops, d, "dma-cont",
|
|
8 << d->dshift);
|
|
memory_region_add_subregion(isa_address_space_io(NULL),
|
|
base + (8 << d->dshift), &d->cont_io);
|
|
|
|
qemu_register_reset(dma_reset, d);
|
|
dma_reset(d);
|
|
for (i = 0; i < ARRAY_SIZE (d->regs); ++i) {
|
|
d->regs[i].transfer_handler = dma_phony_handler;
|
|
}
|
|
}
|
|
|
|
static const VMStateDescription vmstate_dma_regs = {
|
|
.name = "dma_regs",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.minimum_version_id_old = 1,
|
|
.fields = (VMStateField []) {
|
|
VMSTATE_INT32_ARRAY(now, struct dma_regs, 2),
|
|
VMSTATE_UINT16_ARRAY(base, struct dma_regs, 2),
|
|
VMSTATE_UINT8(mode, struct dma_regs),
|
|
VMSTATE_UINT8(page, struct dma_regs),
|
|
VMSTATE_UINT8(pageh, struct dma_regs),
|
|
VMSTATE_UINT8(dack, struct dma_regs),
|
|
VMSTATE_UINT8(eop, struct dma_regs),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static int dma_post_load(void *opaque, int version_id)
|
|
{
|
|
DMA_run();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_dma = {
|
|
.name = "dma",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.minimum_version_id_old = 1,
|
|
.post_load = dma_post_load,
|
|
.fields = (VMStateField []) {
|
|
VMSTATE_UINT8(command, struct dma_cont),
|
|
VMSTATE_UINT8(mask, struct dma_cont),
|
|
VMSTATE_UINT8(flip_flop, struct dma_cont),
|
|
VMSTATE_INT32(dshift, struct dma_cont),
|
|
VMSTATE_STRUCT_ARRAY(regs, struct dma_cont, 4, 1, vmstate_dma_regs, struct dma_regs),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit)
|
|
{
|
|
dma_init2(&dma_controllers[0], 0x00, 0, 0x80,
|
|
high_page_enable ? 0x480 : -1, cpu_request_exit);
|
|
dma_init2(&dma_controllers[1], 0xc0, 1, 0x88,
|
|
high_page_enable ? 0x488 : -1, cpu_request_exit);
|
|
vmstate_register (NULL, 0, &vmstate_dma, &dma_controllers[0]);
|
|
vmstate_register (NULL, 1, &vmstate_dma, &dma_controllers[1]);
|
|
|
|
dma_bh = qemu_bh_new(DMA_run_bh, NULL);
|
|
}
|