[Qemu-devel] [PATCH 01/17] ide: Add handler to ide_cmd_table

[Kevin Wolf <kwolf@redhat.com>]

As a preparation for moving all IDE commands into their own function
like in the ATAPI code, introduce a 'handler' callback to ide_cmd_table.

Commands using this new infrastructure get some things handled
automatically:

* The BSY flag is set before calling the handler (in order to avoid bugs
  like the one fixed in f68ec837) and reset on completion.

* The (obsolete) DSC flag in the status register is set on completion if
  the command is flagged with SET_DSC in the command table

* An IRQ is triggered on completion.

* The error register and the ERR flag in the status register are cleared
  before calling the handler and on completion it is asserted that
  either none or both of them are set.

No commands are converted at this point.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/ide/core.c | 144 +++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 86 insertions(+), 58 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index 9926d92..cd9de14 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1010,71 +1010,78 @@ void ide_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 #define HD_CFA_OK (HD_OK | CFA_OK)
 #define ALL_OK (HD_OK | CD_OK | CFA_OK)
 
+/* Set the Disk Seek Completed status bit during completion */
+#define SET_DSC (1u << 8)
+
 /* See ACS-2 T13/2015-D Table B.2 Command codes */
-static const uint8_t ide_cmd_table[0x100] = {
+static const struct {
+    /* Returns true if the completion code should be run */
+    bool (*handler)(IDEState *s, uint8_t cmd);
+    int flags;
+} ide_cmd_table[0x100] = {
     /* NOP not implemented, mandatory for CD */
-    [CFA_REQ_EXT_ERROR_CODE]            = CFA_OK,
-    [WIN_DSM]                           = ALL_OK,
-    [WIN_DEVICE_RESET]                  = CD_OK,
-    [WIN_RECAL]                         = HD_CFA_OK,
-    [WIN_READ]                          = ALL_OK,
-    [WIN_READ_ONCE]                     = ALL_OK,
-    [WIN_READ_EXT]                      = HD_CFA_OK,
-    [WIN_READDMA_EXT]                   = HD_CFA_OK,
-    [WIN_READ_NATIVE_MAX_EXT]           = HD_CFA_OK,
-    [WIN_MULTREAD_EXT]                  = HD_CFA_OK,
-    [WIN_WRITE]                         = HD_CFA_OK,
-    [WIN_WRITE_ONCE]                    = HD_CFA_OK,
-    [WIN_WRITE_EXT]                     = HD_CFA_OK,
-    [WIN_WRITEDMA_EXT]                  = HD_CFA_OK,
-    [CFA_WRITE_SECT_WO_ERASE]           = CFA_OK,
-    [WIN_MULTWRITE_EXT]                 = HD_CFA_OK,
-    [WIN_WRITE_VERIFY]                  = HD_CFA_OK,
-    [WIN_VERIFY]                        = HD_CFA_OK,
-    [WIN_VERIFY_ONCE]                   = HD_CFA_OK,
-    [WIN_VERIFY_EXT]                    = HD_CFA_OK,
-    [WIN_SEEK]                          = HD_CFA_OK,
-    [CFA_TRANSLATE_SECTOR]              = CFA_OK,
-    [WIN_DIAGNOSE]                      = ALL_OK,
-    [WIN_SPECIFY]                       = HD_CFA_OK,
-    [WIN_STANDBYNOW2]                   = ALL_OK,
-    [WIN_IDLEIMMEDIATE2]                = ALL_OK,
-    [WIN_STANDBY2]                      = ALL_OK,
-    [WIN_SETIDLE2]                      = ALL_OK,
-    [WIN_CHECKPOWERMODE2]               = ALL_OK,
-    [WIN_SLEEPNOW2]                     = ALL_OK,
-    [WIN_PACKETCMD]                     = CD_OK,
-    [WIN_PIDENTIFY]                     = CD_OK,
-    [WIN_SMART]                         = HD_CFA_OK,
-    [CFA_ACCESS_METADATA_STORAGE]       = CFA_OK,
-    [CFA_ERASE_SECTORS]                 = CFA_OK,
-    [WIN_MULTREAD]                      = HD_CFA_OK,
-    [WIN_MULTWRITE]                     = HD_CFA_OK,
-    [WIN_SETMULT]                       = HD_CFA_OK,
-    [WIN_READDMA]                       = HD_CFA_OK,
-    [WIN_READDMA_ONCE]                  = HD_CFA_OK,
-    [WIN_WRITEDMA]                      = HD_CFA_OK,
-    [WIN_WRITEDMA_ONCE]                 = HD_CFA_OK,
-    [CFA_WRITE_MULTI_WO_ERASE]          = CFA_OK,
-    [WIN_STANDBYNOW1]                   = ALL_OK,
-    [WIN_IDLEIMMEDIATE]                 = ALL_OK,
-    [WIN_STANDBY]                       = ALL_OK,
-    [WIN_SETIDLE1]                      = ALL_OK,
-    [WIN_CHECKPOWERMODE1]               = ALL_OK,
-    [WIN_SLEEPNOW1]                     = ALL_OK,
-    [WIN_FLUSH_CACHE]                   = ALL_OK,
-    [WIN_FLUSH_CACHE_EXT]               = HD_CFA_OK,
-    [WIN_IDENTIFY]                      = ALL_OK,
-    [WIN_SETFEATURES]                   = ALL_OK,
-    [IBM_SENSE_CONDITION]               = CFA_OK,
-    [CFA_WEAR_LEVEL]                    = HD_CFA_OK,
-    [WIN_READ_NATIVE_MAX]               = ALL_OK,
+    [CFA_REQ_EXT_ERROR_CODE]      = { NULL, CFA_OK },
+    [WIN_DSM]                     = { NULL, ALL_OK },
+    [WIN_DEVICE_RESET]            = { NULL, CD_OK },
+    [WIN_RECAL]                   = { NULL, HD_CFA_OK },
+    [WIN_READ]                    = { NULL, ALL_OK },
+    [WIN_READ_ONCE]               = { NULL, ALL_OK },
+    [WIN_READ_EXT]                = { NULL, HD_CFA_OK },
+    [WIN_READDMA_EXT]             = { NULL, HD_CFA_OK },
+    [WIN_READ_NATIVE_MAX_EXT]     = { NULL, HD_CFA_OK },
+    [WIN_MULTREAD_EXT]            = { NULL, HD_CFA_OK },
+    [WIN_WRITE]                   = { NULL, HD_CFA_OK },
+    [WIN_WRITE_ONCE]              = { NULL, HD_CFA_OK },
+    [WIN_WRITE_EXT]               = { NULL, HD_CFA_OK },
+    [WIN_WRITEDMA_EXT]            = { NULL, HD_CFA_OK },
+    [CFA_WRITE_SECT_WO_ERASE]     = { NULL, CFA_OK },
+    [WIN_MULTWRITE_EXT]           = { NULL, HD_CFA_OK },
+    [WIN_WRITE_VERIFY]            = { NULL, HD_CFA_OK },
+    [WIN_VERIFY]                  = { NULL, HD_CFA_OK },
+    [WIN_VERIFY_ONCE]             = { NULL, HD_CFA_OK },
+    [WIN_VERIFY_EXT]              = { NULL, HD_CFA_OK },
+    [WIN_SEEK]                    = { NULL, HD_CFA_OK },
+    [CFA_TRANSLATE_SECTOR]        = { NULL, CFA_OK },
+    [WIN_DIAGNOSE]                = { NULL, ALL_OK },
+    [WIN_SPECIFY]                 = { NULL, HD_CFA_OK },
+    [WIN_STANDBYNOW2]             = { NULL, ALL_OK },
+    [WIN_IDLEIMMEDIATE2]          = { NULL, ALL_OK },
+    [WIN_STANDBY2]                = { NULL, ALL_OK },
+    [WIN_SETIDLE2]                = { NULL, ALL_OK },
+    [WIN_CHECKPOWERMODE2]         = { NULL, ALL_OK },
+    [WIN_SLEEPNOW2]               = { NULL, ALL_OK },
+    [WIN_PACKETCMD]               = { NULL, CD_OK },
+    [WIN_PIDENTIFY]               = { NULL, CD_OK },
+    [WIN_SMART]                   = { NULL, HD_CFA_OK },
+    [CFA_ACCESS_METADATA_STORAGE] = { NULL, CFA_OK },
+    [CFA_ERASE_SECTORS]           = { NULL, CFA_OK },
+    [WIN_MULTREAD]                = { NULL, HD_CFA_OK },
+    [WIN_MULTWRITE]               = { NULL, HD_CFA_OK },
+    [WIN_SETMULT]                 = { NULL, HD_CFA_OK },
+    [WIN_READDMA]                 = { NULL, HD_CFA_OK },
+    [WIN_READDMA_ONCE]            = { NULL, HD_CFA_OK },
+    [WIN_WRITEDMA]                = { NULL, HD_CFA_OK },
+    [WIN_WRITEDMA_ONCE]           = { NULL, HD_CFA_OK },
+    [CFA_WRITE_MULTI_WO_ERASE]    = { NULL, CFA_OK },
+    [WIN_STANDBYNOW1]             = { NULL, ALL_OK },
+    [WIN_IDLEIMMEDIATE]           = { NULL, ALL_OK },
+    [WIN_STANDBY]                 = { NULL, ALL_OK },
+    [WIN_SETIDLE1]                = { NULL, ALL_OK },
+    [WIN_CHECKPOWERMODE1]         = { NULL, ALL_OK },
+    [WIN_SLEEPNOW1]               = { NULL, ALL_OK },
+    [WIN_FLUSH_CACHE]             = { NULL, ALL_OK },
+    [WIN_FLUSH_CACHE_EXT]         = { NULL, HD_CFA_OK },
+    [WIN_IDENTIFY]                = { NULL, ALL_OK },
+    [WIN_SETFEATURES]             = { NULL, ALL_OK },
+    [IBM_SENSE_CONDITION]         = { NULL, CFA_OK },
+    [CFA_WEAR_LEVEL]              = { NULL, HD_CFA_OK },
+    [WIN_READ_NATIVE_MAX]         = { NULL, ALL_OK },
 };
 
 static bool ide_cmd_permitted(IDEState *s, uint32_t cmd)
 {
     return cmd < ARRAY_SIZE(ide_cmd_table)
-        && (ide_cmd_table[cmd] & (1u << s->drive_kind));
+        && (ide_cmd_table[cmd].flags & (1u << s->drive_kind));
 }
 
 void ide_exec_cmd(IDEBus *bus, uint32_t val)
@@ -1100,6 +1107,27 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
         goto abort_cmd;
     }
 
+    if (ide_cmd_table[val].handler != NULL) {
+        bool complete;
+
+        s->status = READY_STAT | BUSY_STAT;
+        s->error = 0;
+
+        complete = ide_cmd_table[val].handler(s, val);
+        if (complete) {
+            s->status &= ~BUSY_STAT;
+            assert(!!s->error == !!(s->status & ERR_STAT));
+
+            if ((ide_cmd_table[val].flags & SET_DSC) && !s->error) {
+                s->status |= SEEK_STAT;
+            }
+
+            ide_set_irq(s->bus);
+        }
+
+        return;
+    }
+
     switch(val) {
     case WIN_DSM:
         switch (s->feature) {
-- 
1.8.1.4