Z80: add a flat binary to Z80 snapshot maker

Yes one day we'll need a boot loader but for emulator debug work it's so much
easier to work on snapshots

diff --git a/Kernel/cpu-z80/image.mk b/Kernel/cpu-z80/image.mk
index 58a6eef..73cdd73 100644 (file)
--- a/Kernel/cpu-z80/image.mk
+++ b/Kernel/cpu-z80/image.mk
@@ -15,6 +15,8 @@ tools/bin2sna: tools/bin2sna.c
 
 tools/bin2z80: tools/bin2z80.c
 
+tools/flat2z80: tools/flat2z80.c
+
 tools/bankld/sdldz80:
        +(cd tools/bankld; make)
 
@@ -26,7 +28,7 @@ tools/makejv3: tools/makejv3.c
 fuzix.ihx: target $(OBJS) platform-$(TARGET)/fuzix.lnk tools/bankld/sdldz80
        $(CROSS_LD) -n -k $(LIBZ80) -f platform-$(TARGET)/fuzix.lnk
 
-fuzix.bin: fuzix.ihx tools/bihx tools/analysemap tools/memhogs tools/binman tools/bintomdv tools/binmunge tools/bin2sna tools/bin2z80 cpm-loader/cpmload.bin
+fuzix.bin: fuzix.ihx tools/bihx tools/analysemap tools/memhogs tools/binman tools/bintomdv tools/binmunge tools/bin2sna tools/bin2z80 cpm-loader/cpmload.bin tools/flat2z80
        -cp hogs.txt hogs.txt.old
        tools/memhogs <fuzix.map |sort -nr >hogs.txt
        head -5 hogs.txt

diff --git a/Kernel/tools/flat2z80.c b/Kernel/tools/flat2z80.c
new file mode 100644 (file)
index 0000000..359f870
--- /dev/null
+++ b/Kernel/tools/flat2z80.c
@@ -0,0 +1,109 @@
+/*
+ *     Convert an unbanked binary into a ZX spectrum +3 image for ease
+ *     of testing.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <fcntl.h>
+
+static uint8_t emptybank[16384];
+static uint8_t bank3[16384];
+static uint8_t bank4[16384];
+static uint8_t bank6[16384];
+static uint8_t bank7[16384];
+
+static uint8_t header[86];
+static uint8_t blkhdr[3] = { 0xFF, 0xFF, 0x00 };
+
+static void write_buf(char *name, int fd, uint8_t *buf, int len)
+{
+       if (write(fd, buf, len) != len) {
+               perror(name);
+               exit(1);
+       }
+}
+
+static void load_bank(uint8_t *p, int fd)
+{
+       if (read(fd, p, 16384) < 1) {
+               perror("read");
+               exit(1);
+       }
+}
+
+static void load_first_bank(uint8_t *p, int fd)
+{
+       if (read(fd, p + 256, 16384 - 256) < 1) {
+               perror("read");
+               exit(1);
+       }
+}
+
+static void writeblock(int fd, int block, uint8_t *ptr)
+{
+       blkhdr[2] = 3 + block;
+       write(fd, blkhdr, 3);
+       write(fd, ptr, 16384);
+       printf("Bank %d signature %x %x %x\n",
+               block, ptr[0],ptr[1],ptr[2]);
+       
+}
+
+static void write_z80(char *name)
+{
+       int fd = open(name, O_WRONLY|O_CREAT|O_TRUNC, 0644);
+       if (fd == -1) {
+               perror(name);
+               exit(1);
+       }
+       header[8] = 0xF0;               /* set SP somewhere */
+       header[9] = 0xFF;
+       
+       header[29] = 0x40 | 1;          /* IM1, Kempston joystick */
+       header[30] = 55;
+       header[32] = 0x00;              /* Run from 0x0100 */
+       header[33] = 0x01;
+       header[34] = 7;                 /* Spectrum +3 */
+       header[35] = 0;                 /* Screen at bank 5 */
+       header[37] = 3;                 /* Emulate LDIR and R details */
+       header[61] = 0x00;              /* low memory is RAM */
+       header[62] = 0x00;
+       header[86] = 0x07;              /* Map 4/7/6/3 */
+       write(fd, header, 87);          /* Header */
+
+       writeblock(fd, 0, emptybank);
+       writeblock(fd, 1, emptybank);
+       writeblock(fd, 2, emptybank);
+       writeblock(fd, 3, bank3);
+       writeblock(fd, 4, bank4);
+       writeblock(fd, 5, emptybank);
+       writeblock(fd, 6, bank6);
+       writeblock(fd, 7, bank7);
+       close(fd);
+}
+
+
+int main(int argc, char *argv[])
+{
+       int fd;
+       if (argc != 3) {
+               fprintf(stderr, "%s: input.bin output.z80\n", argv[0]);
+               exit(1);
+       }
+       fd = open(argv[1], O_RDONLY);
+       if (fd == -1) {
+               perror(argv[1]);
+               exit(1);
+       }
+       load_first_bank(bank4, fd);
+       load_bank(bank7, fd);
+       load_bank(bank6, fd);
+       load_bank(bank3, fd);
+       close(fd);
+       write_z80(argv[2]);
+       exit(0);
+}