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-rw-r--r--tools/intel_vga_write.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/tools/intel_vga_write.c b/tools/intel_vga_write.c
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+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Ville Syrjälä <ville.syrjala@linux.intel.com>
+ *
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/io.h>
+#include "intel_gpu_tools.h"
+
+static void write_reg(uint32_t reg, uint8_t val, bool use_mmio)
+{
+ if (use_mmio)
+ *((volatile uint8_t *)mmio + reg) = val;
+ else
+ outb(val, reg);
+}
+
+static void usage(const char *cmdname)
+{
+ printf("Usage: %s [-m] addr value\n", cmdname);
+ printf("\t -m : use MMIO instead of port IO\n");
+ printf("\t addr,value : in 0xXXXX format\n");
+}
+
+int main(int argc, char *argv[])
+{
+ bool use_mmio = false;
+ int ret = 0;
+ uint32_t reg, val;
+ int ch;
+ const char *cmdname = argv[0];
+
+ while ((ch = getopt(argc, argv, "m")) != -1) {
+ switch(ch) {
+ case 'm':
+ use_mmio = true;
+ break;
+ default:
+ break;
+ }
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc < 2) {
+ usage(cmdname);
+ return 1;
+ }
+
+ sscanf(argv[0], "0x%x", &reg);
+ sscanf(argv[1], "0x%x", &val);
+
+ if (use_mmio)
+ intel_register_access_init(intel_get_pci_device(), 0);
+ else
+ assert(iopl(3) == 0);
+
+ write_reg(reg, val, use_mmio);
+
+ if (use_mmio)
+ intel_register_access_fini();
+ else
+ iopl(0);
+
+ return ret;
+}
+