Move CMOS handling into separate files in accessors

Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6313 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

util/nvramtool/accessors/cmos-hw-unix.c

@@ -0,0 +1,122 @@
+#include <assert.h>
+#include "cmos_lowlevel.h"
+
+#if defined(__FreeBSD__)
+#include <sys/types.h>
+#include <machine/cpufunc.h>
+#define OUTB(x, y) do { u_int tmp = (y); outb(tmp, (x)); } while (0)
+#define OUTW(x, y) do { u_int tmp = (y); outw(tmp, (x)); } while (0)
+#define OUTL(x, y) do { u_int tmp = (y); outl(tmp, (x)); } while (0)
+#define INB(x) __extension__ ({ u_int tmp = (x); inb(tmp); })
+#define INW(x) __extension__ ({ u_int tmp = (x); inw(tmp); })
+#define INL(x) __extension__ ({ u_int tmp = (x); inl(tmp); })
+#else
+#if defined(__GLIBC__)
+#include <sys/io.h>
+#endif
+#if (defined(__MACH__) && defined(__APPLE__))
+#include <DirectIO/darwinio.h>
+#endif
+#define OUTB outb
+#define OUTW outw
+#define OUTL outl
+#define INB  inb
+#define INW  inw
+#define INL  inl
+#endif
+
+static void cmos_hal_init(void* data);
+static unsigned char cmos_hal_read(unsigned addr);
+static void cmos_hal_write(unsigned addr, unsigned char value);
+static void cmos_set_iopl(int level);
+
+/* no need to initialize anything */
+static void cmos_hal_init(__attribute__((unused)) void *data)
+{
+}
+
+static unsigned char cmos_hal_read(unsigned index)
+{
+	unsigned short port_0, port_1;
+
+	assert(!verify_cmos_byte_index(index));
+
+	if (index < 128) {
+		port_0 = 0x70;
+		port_1 = 0x71;
+	} else {
+		port_0 = 0x72;
+		port_1 = 0x73;
+	}
+
+	OUTB(index, port_0);
+	return INB(port_1);
+}
+
+static void cmos_hal_write(unsigned index, unsigned char value)
+{
+	unsigned short port_0, port_1;
+
+	assert(!verify_cmos_byte_index(index));
+
+	if (index < 128) {
+		port_0 = 0x70;
+		port_1 = 0x71;
+	} else {
+		port_0 = 0x72;
+		port_1 = 0x73;
+	}
+
+	OUTB(index, port_0);
+	OUTB(value, port_1);
+}
+
+
+/****************************************************************************
+ * cmos_set_iopl
+ *
+ * Set the I/O privilege level of the executing process.  Root privileges are
+ * required for performing this action.  A sufficient I/O privilege level
+ * allows the process to access x86 I/O address space and to disable/reenable
+ * interrupts while executing in user space.  Messing with the I/O privilege
+ * level is therefore somewhat dangerous.
+ ****************************************************************************/
+static void cmos_set_iopl(int level)
+{
+#if defined(__FreeBSD__)
+	static int io_fd = -1;
+#endif
+
+	assert((level >= 0) && (level <= 3));
+
+#if defined(__FreeBSD__)
+	if (level == 0) {
+		if (io_fd != -1) {
+			close(io_fd);
+			io_fd = -1;
+		}
+	} else {
+		if (io_fd == -1) {
+			io_fd = open("/dev/io", O_RDWR);
+			if (io_fd < 0) {
+				perror("/dev/io");
+				exit(1);
+			}
+		}
+	}
+#else
+	if (iopl(level)) {
+		fprintf(stderr, "%s: iopl() system call failed.  "
+			"You must be root to do this.\n", prog_name);
+		exit(1);
+	}
+#endif
+}
+
+cmos_access_t cmos_hal = {
+	.init = cmos_hal_init,
+	.read = cmos_hal_read,
+	.write = cmos_hal_write,
+	.set_iopl = cmos_set_iopl,
+};
+