1 files changed, 92 insertions, 0 deletions
diff --git a/core/init.c b/core/init.c
new file mode 100644
index 00000000..f286622f
--- /dev/null
+++ b/core/init.c
@@ -0,0 +1,92 @@
+#include <core.h>
+#include <com32.h>
+#include <sys/io.h>
+#include <fs.h>
+#include <bios.h>
+
+static uint32_t min_lowmem_heap = 65536;
+extern char __lowmem_heap[];
+uint8_t KbdFlags;		/* Check for keyboard escapes */
+__export uint8_t KbdMap[256];	/* Keyboard map */
+
+__export uint16_t PXERetry;
+
+static inline void check_escapes(void)
+{
+	com32sys_t ireg, oreg;
+
+	ireg.eax.b[1] = 0x02;	/* Check keyboard flags */
+	__intcall(0x16, &ireg, &oreg);
+
+	KbdFlags = oreg.eax.b[0];
+
+	/* Ctrl->skip 386 check */
+	if (oreg.eax.b[0] & 0x04) {
+		/*
+		 * Now check that there is sufficient low (DOS) memory
+		 *
+		 * NOTE: Linux doesn't use all of real_mode_seg, but we use
+		 * the same segment for COMBOOT images, which can use all 64K.
+		 */
+		uint16_t mem;
+
+		__intcall(0x12, &ireg, &oreg);
+
+		mem = ((uint32_t)__lowmem_heap) + min_lowmem_heap + 1023;
+		mem = mem >> 10;
+
+		if (mem < oreg.eax.w[0]) {
+			char buf[256];
+
+			snprintf(buf, sizeof(buf),
+				 "It appears your computer has only "
+				 "%dK of low (\"DOS\") RAM.\n"
+				 "This version of Syslinux needs "
+				 "%dK to boot.  "
+				 "If you get this\nmessage in error, "
+				 "hold down the Ctrl key while booting, "
+				 "and I\nwill take your word for it.\n",
+				 oreg.eax.w[0], mem);
+			writestr(buf);
+			kaboom();
+		}
+	}
+}
+
+extern uint32_t BIOS_timer_next;
+extern uint32_t timer_irq;
+static inline void bios_timer_init(void)
+{
+	unsigned long next;
+	uint32_t *hook = (uint32_t *)BIOS_timer_hook;
+
+	next = *hook;
+	BIOS_timer_next = next;
+	*hook = (uint32_t)&timer_irq;
+}
+
+void init(com32sys_t *regs __unused)
+{
+	int i;
+
+	/* Initialize timer */
+	bios_timer_init();
+
+	for (i = 0; i < 256; i++)
+		KbdMap[i] = i;
+
+	adjust_screen();
+
+	/* Init the memory subsystem */
+	mem_init();
+
+	dprintf("%s%s", syslinux_banner, copyright_str);
+
+	/* CPU-dependent initialization and related checks. */
+	check_escapes();
+
+	/*
+	 * Scan the DMI tables for interesting information.
+	 */
+	dmi_init();
+}