misc: Add initial fw ROM loading

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/emux64/src/rom.c b/emux64/src/rom.c
new file mode 100644
index 0000000..24d447d
--- /dev/null
+++ b/emux64/src/rom.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "rom.h"
+
+int
+rom_open(const char *path, struct osmx_rom *res)
+{
+    int fd;
+
+    if (path == NULL || res == NULL) {
+        return -EINVAL;
+    }
+
+    fd = open(path, O_RDONLY);
+    if (fd < 0) {
+        perror("open");
+        return fd;
+    }
+
+    /* Get the ROM length */
+    res->length = lseek(fd, 0, SEEK_END);
+    lseek(fd, 0, SEEK_SET);
+
+    /* Allocate space for the ROM */
+    res->buf = malloc(res->length);
+    if (res->buf == NULL) {
+        printf("error: out of host memory\n");
+        close(fd);
+        return -ENOMEM;
+    }
+
+    read(fd, res->buf, res->length);
+    close(fd);
+    return 0;
+}
+
+void
+rom_release(struct osmx_rom *rom)
+{
+    if (rom == NULL) {
+        return;
+    }
+
+    if (rom->buf == NULL) {
+        return;
+    }
+
+    free(rom->buf);
+    rom->buf = NULL;
+}