vga: Replace VGA_COMMON with a structure

All VGA devices share a common field subset; currently they do so by
a macro which defines the common fields inline their state structures,
relying on the the common state being placed at offset 0 in the structure.
This makes refactoring the code difficult and requires a lot of error prone
casts.

Replace the macro by a new VGACommonState structure, and the casts by
regular field access and container_of() for upcasts.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 84 insertions, 86 deletions

diff --git a/hw/vga_int.h b/hw/vga_int.h
index 1971aa6..3202cde 100644
--- a/hw/vga_int.h
+++ b/hw/vga_int.h
@@ -94,94 +94,92 @@ union vga_retrace {
     struct vga_precise_retrace precise;
 };
 
-struct VGAState;
-typedef uint8_t (* vga_retrace_fn)(struct VGAState *s);
-typedef void (* vga_update_retrace_info_fn)(struct VGAState *s);
-
-#define VGA_STATE_COMMON                                                \
-    uint8_t *vram_ptr;                                                  \
-    ram_addr_t vram_offset;                                             \
-    unsigned int vram_size;                                             \
-    uint32_t lfb_addr;                                                  \
-    uint32_t lfb_end;                                                   \
-    uint32_t map_addr;                                                  \
-    uint32_t map_end;                                                   \
-    uint32_t lfb_vram_mapped; /* whether 0xa0000 is mapped as ram */    \
-    unsigned long bios_offset;                                          \
-    unsigned int bios_size;                                             \
-    int it_shift;                                                       \
-    PCIDevice *pci_dev;                                                 \
-    uint32_t latch;                                                     \
-    uint8_t sr_index;                                                   \
-    uint8_t sr[256];                                                    \
-    uint8_t gr_index;                                                   \
-    uint8_t gr[256];                                                    \
-    uint8_t ar_index;                                                   \
-    uint8_t ar[21];                                                     \
-    int ar_flip_flop;                                                   \
-    uint8_t cr_index;                                                   \
-    uint8_t cr[256]; /* CRT registers */                                \
-    uint8_t msr; /* Misc Output Register */                             \
-    uint8_t fcr; /* Feature Control Register */                         \
-    uint8_t st00; /* status 0 */                                        \
-    uint8_t st01; /* status 1 */                                        \
-    uint8_t dac_state;                                                  \
-    uint8_t dac_sub_index;                                              \
-    uint8_t dac_read_index;                                             \
-    uint8_t dac_write_index;                                            \
-    uint8_t dac_cache[3]; /* used when writing */                       \
-    int dac_8bit;                                                       \
-    uint8_t palette[768];                                               \
-    int32_t bank_offset;                                                \
-    int vga_io_memory;                                             \
-    int (*get_bpp)(struct VGAState *s);                                 \
-    void (*get_offsets)(struct VGAState *s,                             \
-                        uint32_t *pline_offset,                         \
-                        uint32_t *pstart_addr,                          \
-                        uint32_t *pline_compare);                       \
-    void (*get_resolution)(struct VGAState *s,                          \
-                        int *pwidth,                                    \
-                        int *pheight);                                  \
-    VGA_STATE_COMMON_BOCHS_VBE                                          \
-    /* display refresh support */                                       \
-    DisplayState *ds;                                                   \
-    uint32_t font_offsets[2];                                           \
-    int graphic_mode;                                                   \
-    uint8_t shift_control;                                              \
-    uint8_t double_scan;                                                \
-    uint32_t line_offset;                                               \
-    uint32_t line_compare;                                              \
-    uint32_t start_addr;                                                \
-    uint32_t plane_updated;                                             \
-    uint32_t last_line_offset;                                          \
-    uint8_t last_cw, last_ch;                                           \
-    uint32_t last_width, last_height; /* in chars or pixels */          \
-    uint32_t last_scr_width, last_scr_height; /* in pixels */           \
-    uint32_t last_depth; /* in bits */                                  \
-    uint8_t cursor_start, cursor_end;                                   \
-    uint32_t cursor_offset;                                             \
-    unsigned int (*rgb_to_pixel)(unsigned int r,                        \
-                                 unsigned int g, unsigned b);           \
-    vga_hw_update_ptr update;                                           \
-    vga_hw_invalidate_ptr invalidate;                                   \
-    vga_hw_screen_dump_ptr screen_dump;                                 \
-    vga_hw_text_update_ptr text_update;                                 \
-    /* hardware mouse cursor support */                                 \
-    uint32_t invalidated_y_table[VGA_MAX_HEIGHT / 32];                  \
-    void (*cursor_invalidate)(struct VGAState *s);                      \
-    void (*cursor_draw_line)(struct VGAState *s, uint8_t *d, int y);    \
-    /* tell for each page if it has been updated since the last time */ \
-    uint32_t last_palette[256];                                         \
-    uint32_t last_ch_attr[CH_ATTR_SIZE]; /* XXX: make it dynamic */     \
-    /* retrace */                                                       \
-    vga_retrace_fn retrace;                                             \
-    vga_update_retrace_info_fn update_retrace_info;                     \
+struct VGACommonState;
+typedef uint8_t (* vga_retrace_fn)(struct VGACommonState *s);
+typedef void (* vga_update_retrace_info_fn)(struct VGACommonState *s);
+
+typedef struct VGACommonState {
+    uint8_t *vram_ptr;
+    ram_addr_t vram_offset;
+    unsigned int vram_size;
+    uint32_t lfb_addr;
+    uint32_t lfb_end;
+    uint32_t map_addr;
+    uint32_t map_end;
+    uint32_t lfb_vram_mapped; /* whether 0xa0000 is mapped as ram */
+    unsigned long bios_offset;
+    unsigned int bios_size;
+    int it_shift;
+    PCIDevice *pci_dev;
+    uint32_t latch;
+    uint8_t sr_index;
+    uint8_t sr[256];
+    uint8_t gr_index;
+    uint8_t gr[256];
+    uint8_t ar_index;
+    uint8_t ar[21];
+    int ar_flip_flop;
+    uint8_t cr_index;
+    uint8_t cr[256]; /* CRT registers */
+    uint8_t msr; /* Misc Output Register */
+    uint8_t fcr; /* Feature Control Register */
+    uint8_t st00; /* status 0 */
+    uint8_t st01; /* status 1 */
+    uint8_t dac_state;
+    uint8_t dac_sub_index;
+    uint8_t dac_read_index;
+    uint8_t dac_write_index;
+    uint8_t dac_cache[3]; /* used when writing */
+    int dac_8bit;
+    uint8_t palette[768];
+    int32_t bank_offset;
+    int vga_io_memory;
+    int (*get_bpp)(struct VGACommonState *s);
+    void (*get_offsets)(struct VGACommonState *s,
+                        uint32_t *pline_offset,
+                        uint32_t *pstart_addr,
+                        uint32_t *pline_compare);
+    void (*get_resolution)(struct VGACommonState *s,
+                        int *pwidth,
+                        int *pheight);
+    VGA_STATE_COMMON_BOCHS_VBE
+    /* display refresh support */
+    DisplayState *ds;
+    uint32_t font_offsets[2];
+    int graphic_mode;
+    uint8_t shift_control;
+    uint8_t double_scan;
+    uint32_t line_offset;
+    uint32_t line_compare;
+    uint32_t start_addr;
+    uint32_t plane_updated;
+    uint32_t last_line_offset;
+    uint8_t last_cw, last_ch;
+    uint32_t last_width, last_height; /* in chars or pixels */
+    uint32_t last_scr_width, last_scr_height; /* in pixels */
+    uint32_t last_depth; /* in bits */
+    uint8_t cursor_start, cursor_end;
+    uint32_t cursor_offset;
+    unsigned int (*rgb_to_pixel)(unsigned int r,
+                                 unsigned int g, unsigned b);
+    vga_hw_update_ptr update;
+    vga_hw_invalidate_ptr invalidate;
+    vga_hw_screen_dump_ptr screen_dump;
+    vga_hw_text_update_ptr text_update;
+    /* hardware mouse cursor support */
+    uint32_t invalidated_y_table[VGA_MAX_HEIGHT / 32];
+    void (*cursor_invalidate)(struct VGACommonState *s);
+    void (*cursor_draw_line)(struct VGACommonState *s, uint8_t *d, int y);
+    /* tell for each page if it has been updated since the last time */
+    uint32_t last_palette[256];
+    uint32_t last_ch_attr[CH_ATTR_SIZE]; /* XXX: make it dynamic */
+    /* retrace */
+    vga_retrace_fn retrace;
+    vga_update_retrace_info_fn update_retrace_info;
     union vga_retrace retrace_info;
+} VGACommonState;
 
-
-typedef struct VGAState {
-    VGA_STATE_COMMON
-} VGAState;
+typedef VGACommonState VGAState;
 
 static inline int c6_to_8(int v)
 {