applesmc: implement error status port
As of release 10.12.4, OS X (Sierra) refuses to boot unless the AppleSMC supports an additional I/O port, expected to provide an error status code. Update the [cmd|data]_write() and data_read() methods to implement the required state machine, and add I/O region & methods to handle access to the error port. Originally proposed by Eric Shelton <eshelton@pobox.com> based in part on FakeSMC (git://git.assembla.com/fakesmc.git). Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Phil Dennis-Jordan <phil@philjordan.eu> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 1497639316-22202-3-git-send-email-gsomlo@gmail.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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@ -43,6 +43,7 @@
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enum {
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APPLESMC_DATA_PORT = 0x00,
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APPLESMC_CMD_PORT = 0x04,
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APPLESMC_ERR_PORT = 0x1e,
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APPLESMC_NUM_PORTS = 0x20,
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};
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@ -53,6 +54,24 @@ enum {
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APPLESMC_GET_KEY_TYPE_CMD = 0x13,
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};
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enum {
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APPLESMC_ST_CMD_DONE = 0x00,
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APPLESMC_ST_DATA_READY = 0x01,
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APPLESMC_ST_BUSY = 0x02,
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APPLESMC_ST_ACK = 0x04,
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APPLESMC_ST_NEW_CMD = 0x08,
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};
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enum {
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APPLESMC_ST_1E_CMD_INTRUPTED = 0x80,
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APPLESMC_ST_1E_STILL_BAD_CMD = 0x81,
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APPLESMC_ST_1E_BAD_CMD = 0x82,
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APPLESMC_ST_1E_NOEXIST = 0x84,
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APPLESMC_ST_1E_WRITEONLY = 0x85,
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APPLESMC_ST_1E_READONLY = 0x86,
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APPLESMC_ST_1E_BAD_INDEX = 0xb8,
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};
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#ifdef DEBUG_SMC
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#define smc_debug(...) fprintf(stderr, "AppleSMC: " __VA_ARGS__)
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#else
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@ -77,9 +96,12 @@ struct AppleSMCState {
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MemoryRegion io_data;
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MemoryRegion io_cmd;
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MemoryRegion io_err;
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uint32_t iobase;
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uint8_t cmd;
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uint8_t status;
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uint8_t status_1e;
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uint8_t last_ret;
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char key[4];
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uint8_t read_pos;
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uint8_t data_len;
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@ -93,89 +115,138 @@ static void applesmc_io_cmd_write(void *opaque, hwaddr addr, uint64_t val,
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unsigned size)
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{
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AppleSMCState *s = opaque;
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uint8_t status = s->status & 0x0f;
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smc_debug("CMD Write B: %#x = %#x\n", addr, val);
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smc_debug("CMD received: 0x%02x\n", (uint8_t)val);
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switch (val) {
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case APPLESMC_READ_CMD:
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s->status = 0x0c;
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/* did last command run through OK? */
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if (status == APPLESMC_ST_CMD_DONE || status == APPLESMC_ST_NEW_CMD) {
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s->cmd = val;
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s->status = APPLESMC_ST_NEW_CMD | APPLESMC_ST_ACK;
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} else {
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smc_debug("ERROR: previous command interrupted!\n");
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s->status = APPLESMC_ST_NEW_CMD;
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s->status_1e = APPLESMC_ST_1E_CMD_INTRUPTED;
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}
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break;
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default:
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smc_debug("UNEXPECTED CMD 0x%02x\n", (uint8_t)val);
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s->status = APPLESMC_ST_NEW_CMD;
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s->status_1e = APPLESMC_ST_1E_BAD_CMD;
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}
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s->cmd = val;
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s->read_pos = 0;
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s->data_pos = 0;
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}
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static void applesmc_fill_data(AppleSMCState *s)
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static struct AppleSMCData *applesmc_find_key(AppleSMCState *s)
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{
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struct AppleSMCData *d;
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QLIST_FOREACH(d, &s->data_def, node) {
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if (!memcmp(d->key, s->key, 4)) {
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smc_debug("Key matched (%s Len=%d Data=%s)\n", d->key,
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d->len, d->data);
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memcpy(s->data, d->data, d->len);
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return;
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return d;
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}
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}
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return NULL;
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}
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static void applesmc_io_data_write(void *opaque, hwaddr addr, uint64_t val,
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unsigned size)
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{
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AppleSMCState *s = opaque;
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struct AppleSMCData *d;
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smc_debug("DATA Write B: %#x = %#x\n", addr, val);
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smc_debug("DATA received: 0x%02x\n", (uint8_t)val);
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switch (s->cmd) {
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case APPLESMC_READ_CMD:
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if ((s->status & 0x0f) == APPLESMC_ST_CMD_DONE) {
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break;
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}
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if (s->read_pos < 4) {
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s->key[s->read_pos] = val;
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s->status = 0x04;
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s->status = APPLESMC_ST_ACK;
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} else if (s->read_pos == 4) {
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s->data_len = val;
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s->status = 0x05;
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s->data_pos = 0;
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smc_debug("Key = %c%c%c%c Len = %d\n", s->key[0],
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s->key[1], s->key[2], s->key[3], val);
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applesmc_fill_data(s);
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d = applesmc_find_key(s);
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if (d != NULL) {
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memcpy(s->data, d->data, d->len);
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s->data_len = d->len;
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s->data_pos = 0;
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s->status = APPLESMC_ST_ACK | APPLESMC_ST_DATA_READY;
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s->status_1e = APPLESMC_ST_CMD_DONE; /* clear on valid key */
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} else {
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smc_debug("READ_CMD: key '%c%c%c%c' not found!\n",
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s->key[0], s->key[1], s->key[2], s->key[3]);
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s->status = APPLESMC_ST_CMD_DONE;
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s->status_1e = APPLESMC_ST_1E_NOEXIST;
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}
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}
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s->read_pos++;
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break;
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default:
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s->status = APPLESMC_ST_CMD_DONE;
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s->status_1e = APPLESMC_ST_1E_STILL_BAD_CMD;
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}
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}
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static void applesmc_io_err_write(void *opaque, hwaddr addr, uint64_t val,
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unsigned size)
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{
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smc_debug("ERR_CODE received: 0x%02x, ignoring!\n", (uint8_t)val);
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/* NOTE: writing to the error port not supported! */
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}
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static uint64_t applesmc_io_data_read(void *opaque, hwaddr addr, unsigned size)
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{
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AppleSMCState *s = opaque;
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uint8_t retval = 0;
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switch (s->cmd) {
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case APPLESMC_READ_CMD:
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if (!(s->status & APPLESMC_ST_DATA_READY)) {
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break;
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}
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if (s->data_pos < s->data_len) {
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retval = s->data[s->data_pos];
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smc_debug("READ_DATA[%d] = %#hhx\n", s->data_pos,
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retval);
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s->last_ret = s->data[s->data_pos];
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smc_debug("READ '%c%c%c%c'[%d] = %02x\n",
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s->key[0], s->key[1], s->key[2], s->key[3],
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s->data_pos, s->last_ret);
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s->data_pos++;
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if (s->data_pos == s->data_len) {
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s->status = 0x00;
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smc_debug("EOF\n");
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s->status = APPLESMC_ST_CMD_DONE;
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smc_debug("READ '%c%c%c%c' Len=%d complete!\n",
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s->key[0], s->key[1], s->key[2], s->key[3],
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s->data_len);
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} else {
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s->status = 0x05;
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s->status = APPLESMC_ST_ACK | APPLESMC_ST_DATA_READY;
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}
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}
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break;
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default:
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s->status = APPLESMC_ST_CMD_DONE;
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s->status_1e = APPLESMC_ST_1E_STILL_BAD_CMD;
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}
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smc_debug("DATA Read b: %#x = %#x\n", addr, retval);
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smc_debug("DATA sent: 0x%02x\n", s->last_ret);
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return retval;
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return s->last_ret;
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}
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static uint64_t applesmc_io_cmd_read(void *opaque, hwaddr addr, unsigned size)
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{
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AppleSMCState *s = opaque;
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smc_debug("CMD Read B: %#x\n", addr);
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smc_debug("CMD sent: 0x%02x\n", s->status);
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return s->status;
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}
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static uint64_t applesmc_io_err_read(void *opaque, hwaddr addr, unsigned size)
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{
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AppleSMCState *s = opaque;
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/* NOTE: read does not clear the 1e status */
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smc_debug("ERR_CODE sent: 0x%02x\n", s->status_1e);
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return s->status_1e;
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}
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static void applesmc_add_key(AppleSMCState *s, const char *key,
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int len, const char *data)
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{
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@ -198,6 +269,9 @@ static void qdev_applesmc_isa_reset(DeviceState *dev)
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QLIST_FOREACH_SAFE(d, &s->data_def, node, next) {
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QLIST_REMOVE(d, node);
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}
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s->status = 0x00;
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s->status_1e = 0x00;
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s->last_ret = 0x00;
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applesmc_add_key(s, "REV ", 6, "\x01\x13\x0f\x00\x00\x03");
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applesmc_add_key(s, "OSK0", 32, s->osk);
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@ -227,6 +301,16 @@ static const MemoryRegionOps applesmc_cmd_io_ops = {
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},
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};
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static const MemoryRegionOps applesmc_err_io_ops = {
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.write = applesmc_io_err_write,
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.read = applesmc_io_err_read,
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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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static void applesmc_isa_realize(DeviceState *dev, Error **errp)
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{
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AppleSMCState *s = APPLE_SMC(dev);
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@ -241,6 +325,11 @@ static void applesmc_isa_realize(DeviceState *dev, Error **errp)
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isa_register_ioport(&s->parent_obj, &s->io_cmd,
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s->iobase + APPLESMC_CMD_PORT);
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memory_region_init_io(&s->io_err, OBJECT(s), &applesmc_err_io_ops, s,
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"applesmc-err", 1);
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isa_register_ioport(&s->parent_obj, &s->io_err,
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s->iobase + APPLESMC_ERR_PORT);
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if (!s->osk || (strlen(s->osk) != 64)) {
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fprintf(stderr, "WARNING: Using AppleSMC with invalid key\n");
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s->osk = default_osk;
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