1 files changed, 99 insertions, 0 deletions
diff --git a/roms/openbios/libopenbios/fcode_load.c b/roms/openbios/libopenbios/fcode_load.c
new file mode 100644
index 000000000..3d2da2f3c
--- /dev/null
+++ b/roms/openbios/libopenbios/fcode_load.c
@@ -0,0 +1,99 @@
+/*
+ * FCode boot loader
+ */
+
+#include "config.h"
+#include "kernel/kernel.h"
+#include "libopenbios/bindings.h"
+#include "libopenbios/fcode_load.h"
+#include "libopenbios/initprogram.h"
+#include "libopenbios/sys_info.h"
+#include "libc/diskio.h"
+#define printf printk
+#define debug printk
+
+static int fd;
+
+int 
+is_fcode(unsigned char *fcode)
+{
+	return (fcode[0] == 0xf0	// start0
+		|| fcode[0] == 0xf1	// start1 
+		|| fcode[0] == 0xf2	// start2
+		|| fcode[0] == 0xf3	// start4
+		|| fcode[0] == 0xfd);	// version1
+}
+
+int 
+fcode_load(ihandle_t dev)
+{
+    int retval = -1;
+    uint8_t fcode_header[8];
+    unsigned long start, size;
+    unsigned int offset;
+
+    /* Mark the saved-program-state as invalid */
+    feval("0 state-valid !");
+
+    fd = open_ih(dev);
+    if (fd == -1) {
+        goto out;
+    }
+
+    for (offset = 0; offset < 16 * 512; offset += 512) {
+        seek_io(fd, offset);
+        if (read_io(fd, &fcode_header, sizeof(fcode_header))
+            != sizeof(fcode_header)) {
+            debug("Can't read FCode header from ihandle " FMT_ucellx "\n", dev);
+            retval = LOADER_NOT_SUPPORT;
+            goto out;
+        }
+
+	if (is_fcode(fcode_header))
+            goto found;
+    }
+
+    debug("Not a bootable FCode image\n");
+    retval = LOADER_NOT_SUPPORT;
+    goto out;
+
+ found:
+    size = (fcode_header[4] << 24) | (fcode_header[5] << 16) |
+        (fcode_header[6] << 8) | fcode_header[7];
+
+    fword("load-base");
+    start = POP();
+
+    printf("\nLoading FCode image...\n");
+
+    seek_io(fd, offset);
+
+    if ((size_t)read_io(fd, (void *)start, size) != size) {
+        printf("Can't read file (size 0x%lx)\n", size);
+        goto out;
+    }
+
+    debug("Loaded %lu bytes\n", size);
+    debug("entry point is %#lx\n", start);
+    
+    // Initialise load-state
+    PUSH(size);
+    feval("load-state >ls.file-size !");
+    feval("fcode load-state >ls.file-type !");
+
+out:
+    close_io(fd);
+    return retval;
+}
+
+void 
+fcode_init_program(void)
+{
+    /* Use trampoline context to execute FCode */
+    PUSH((ucell)&init_fcode_context);
+    feval("load-state >ls.entry !");
+    
+    arch_init_program();
+    
+    feval("-1 state-valid !");
+}