Changeset 0d83ce8 in buchla-emu for emu

Timestamp:

09/10/2017 10:49:20 PM (7 years ago)

Author:

Thomas Lopatic <thomas@…>

Branches:

master

Children:

0529a19, 3311af2

Parents:

67fecc3

Message:

Preload midas.abs, if it exists.

File:

• emu/cpu.c (modified) (4 diffs)

emu/cpu.c

@@ -24 +24 @@
 int32_t cpu_verbose = 0;
 
+#define MIDAS_ABS "midas.abs"
+
 #define CPU_FREQ 7000000
 #define PER_SEC 100000
@@ -51 +53 @@
         hw_write_t write;
 } hw_t;
+
+typedef struct {
+        uint32_t text_loc;
+        uint32_t text_len;
+        uint32_t data_loc;
+        uint32_t data_len;
+        uint32_t bss_loc;
+        uint32_t bss_len;
+        size_t load_len;
+        SDL_RWops *ops;
+} abs_t;
 
 static uint64_t freq;
@@ -136 +149 @@
 }
 
+static void open_abs(const char *path, abs_t *abs)
+{
+        abs->ops = SDL_RWFromFile(path, "rb");
+
+        if (abs->ops == NULL) {
+                fail("error while opening .abs file %s", path);
+        }
+
+        if (SDL_ReadBE16(abs->ops) != 0x601b) {
+                fail("invalid .abs file %s", path);
+        }
+
+        abs->text_len = SDL_ReadBE32(abs->ops);
+        abs->data_len = SDL_ReadBE32(abs->ops);
+        abs->bss_len = SDL_ReadBE32(abs->ops);
+
+        SDL_ReadBE32(abs->ops);
+        SDL_ReadBE32(abs->ops);
+
+        abs->text_loc = SDL_ReadBE32(abs->ops);
+
+        SDL_ReadBE16(abs->ops);
+
+        abs->data_loc = SDL_ReadBE32(abs->ops);
+        abs->bss_loc = SDL_ReadBE32(abs->ops);
+
+        inf("text 0x%x:0x%x data 0x%x:0x%x bss 0x%x:0x%x",
+                        abs->text_loc, abs->text_len, abs->data_loc, abs->data_len, abs->bss_loc, abs->bss_len);
+
+        abs->load_len = (size_t)SDL_RWsize(abs->ops) - 36;
+}
+
+static void load_abs(const char *path, abs_t *abs, uint8_t *data)
+{
+        size_t loaded = 0;
+
+        while (loaded < abs->load_len) {
+                size_t n_rd = SDL_RWread(abs->ops, data + loaded, 1, abs->load_len - loaded);
+
+                if (n_rd == 0) {
+                        fail("error while reading .abs file %s", path);
+                }
+
+                loaded += n_rd;
+        }
+
+        SDL_RWclose(abs->ops);
+}
+
 static void bios_init(void)
 {
         inf("loading BIOS file %s", bios);
 
-        SDL_RWops *ops = SDL_RWFromFile(bios, "rb");
-
-        if (ops == NULL) {
-                fail("error while opening BIOS file %s", bios);
-        }
-
-        if (SDL_ReadBE16(ops) != 0x601b) {
+        abs_t abs;
+        open_abs(bios, &abs);
+
+        if (abs.text_loc != ROM_START || abs.text_loc + abs.text_len != abs.data_loc ||
+                        abs.load_len != abs.text_len + abs.data_len || abs.load_len > ROM_SIZE) {
                 fail("invalid BIOS file %s", bios);
         }
 
-        uint32_t text_len = SDL_ReadBE32(ops);
-        uint32_t data_len = SDL_ReadBE32(ops);
-        uint32_t bss_len = SDL_ReadBE32(ops);
-
-        SDL_ReadBE32(ops);
-        SDL_ReadBE32(ops);
-
-        uint32_t text_loc = SDL_ReadBE32(ops);
-
-        SDL_ReadBE16(ops);
-
-        uint32_t data_loc = SDL_ReadBE32(ops);
-        uint32_t bss_loc = SDL_ReadBE32(ops);
-
-        inf("BIOS text 0x%x:0x%x data 0x%x:0x%x bss 0x%x:0x%x",
-                        text_loc, text_len, data_loc, data_len, bss_loc, bss_len);
-
-        size_t load_len = (size_t)SDL_RWsize(ops) - 36;
-
-        if (text_loc != ROM_START || text_loc + text_len != data_loc ||
-                        load_len != text_len + data_len || load_len > ROM_SIZE) {
-                fail("invalid BIOS file %s", bios);
-        }
-
-        size_t loaded = 0;
-
-        while (loaded < load_len) {
-                size_t n_rd = SDL_RWread(ops, rom_data + loaded, 1, load_len - loaded);
-
-                if (n_rd == 0) {
-                        fail("error while reading BIOS file %s", bios);
-                }
-
-                loaded += n_rd;
-        }
-
-        SDL_RWclose(ops);
-
-        rom_ro_beg = text_loc;
-        rom_ro_end = text_loc + text_len + data_len;
-        rom_rw_beg = bss_loc;
-        rom_rw_end = bss_loc + bss_len;
+        load_abs(bios, &abs, rom_data);
+
+        rom_ro_beg = abs.text_loc;
+        rom_ro_end = abs.text_loc + abs.text_len + abs.data_len;
+        rom_rw_beg = abs.bss_loc;
+        rom_rw_end = abs.bss_loc + abs.bss_len;
 
         ver("rom_ro_beg 0x%08x rom_ro_end 0x%08x", rom_ro_beg, rom_ro_end);
         ver("rom_rw_beg 0x%08x rom_rw_end 0x%08x", rom_rw_beg, rom_rw_end);
+}
+
+static void midas_init(void)
+{
+        SDL_RWops *ops = SDL_RWFromFile(MIDAS_ABS, "rb");
+
+        if (ops == NULL) {
+                return;
+        }
+
+        SDL_RWclose(ops);
+
+        inf("loading MIDAS file " MIDAS_ABS);
+
+        abs_t abs;
+        open_abs(MIDAS_ABS, &abs);
+
+        if (abs.text_loc != APP_START ||
+                        abs.text_loc + abs.text_len != abs.data_loc ||
+                        abs.data_loc + abs.data_len != abs.bss_loc ||
+                        abs.load_len != abs.text_len + abs.data_len ||
+                        abs.bss_loc + abs.bss_len > RAM_SIZE) {
+                fail("invalid MIDAS file " MIDAS_ABS);
+        }
+
+        load_abs(MIDAS_ABS, &abs, ram_data + APP_START - RAM_START);
+
+        ram_ro_beg = ram_rw_beg = APP_START;
+        ram_ro_end = ram_rw_end = RAM_START + RAM_SIZE;
 }
 
@@ -666 +719 @@
         hw_init();
         bios_init();
+        midas_init();
 
         m68k_init();