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authorMatt Fleming <matt.fleming@intel.com>2012-12-03 13:30:36 +0000
committerMatt Fleming <matt.fleming@intel.com>2012-12-03 13:54:46 +0000
commit82cbb1bd4133035fb37a753c15dfaa57e34db87f (patch)
treec76b33222850286a6fa5d379cdddad519a358e0a /com32/elflink/ldlinux/msg.c
parent0163d235652d2cc8f0564da7470983ee450a8a91 (diff)
downloadsyslinux-82cbb1bd4133035fb37a753c15dfaa57e34db87f.tar.gz
syslinux-82cbb1bd4133035fb37a753c15dfaa57e34db87f.tar.xz
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ldlinux: Move DISPLAY file handling out of the coresyslinux-5.00-pre13
The code that handles the DISPLAY directive was writing directly to the BIOS VGA page with __intcall(0x10). This caused corruption problems on the screen because the ansi library code was also writing to the screen. The correct way to fix this is to always use the ansi library code (via printf()) instead of going behind its back and using separate code paths to write to the screen. Reported-by: Ady <ady-sf@hotmail.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'com32/elflink/ldlinux/msg.c')
-rw-r--r--com32/elflink/ldlinux/msg.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/com32/elflink/ldlinux/msg.c b/com32/elflink/ldlinux/msg.c
new file mode 100644
index 00000000..fdb3c981
--- /dev/null
+++ b/com32/elflink/ldlinux/msg.c
@@ -0,0 +1,214 @@
+#include <com32.h>
+#include <stdio.h>
+#include <bios.h>
+#include <graphics.h>
+
+static uint8_t TextAttribute; /* Text attribute for message file */
+static uint8_t DisplayMask; /* Display modes mask */
+
+/* Routine to interpret next print char */
+static void (*NextCharJump)(uint8_t);
+
+void msg_initvars(void);
+static void msg_setfg(uint8_t data);
+static void msg_putchar(uint8_t ch);
+
+/*
+ *
+ * get_msg_file: Load a text file and write its contents to the screen,
+ * interpreting color codes.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int get_msg_file(char *filename)
+{
+ FILE *f;
+ char ch;
+
+ f = fopen(filename, "r");
+ if (!f)
+ return -1;
+
+ TextAttribute = 0x7; /* Default grey on white */
+ DisplayMask = 0x7; /* Display text in all modes */
+ msg_initvars();
+
+ /*
+ * Read the text file a byte at a time and interpret that
+ * byte.
+ */
+ while ((ch = getc(f)) != EOF) {
+ /* DOS EOF? */
+ if (ch == 0x1A)
+ break;
+
+ /*
+ * 01h = text mode
+ * 02h = graphics mode
+ */
+ UsingVGA &= 0x1;
+ UsingVGA += 1;
+
+ NextCharJump(ch); /* Do what shall be done */
+ }
+
+ fclose(f);
+ return 0;
+}
+
+static void msg_setbg(uint8_t data)
+{
+ if (unhexchar(&data) == 0) {
+ data <<= 4;
+ if (DisplayMask & UsingVGA) {
+ TextAttribute = data;
+ }
+
+ NextCharJump = msg_setfg;
+ } else {
+ TextAttribute = 0x7; /* Default attribute */
+ NextCharJump = msg_putchar;
+ }
+}
+
+static void msg_setfg(uint8_t data)
+{
+ if (unhexchar(&data) == 0) {
+ if (DisplayMask & UsingVGA) {
+ /* setbg set foreground to 0 */
+ TextAttribute |= data;
+ }
+ } else
+ TextAttribute = 0x7; /* Default attribute */
+
+ NextCharJump = msg_putchar;
+}
+
+static inline void msg_ctrl_o(void)
+{
+ NextCharJump = msg_setbg;
+}
+
+static void msg_novga(void)
+{
+ syslinux_force_text_mode();
+ msg_initvars();
+}
+
+static void msg_viewimage(void)
+{
+ FILE *f;
+
+ *VGAFilePtr = '\0'; /* Zero-terminate filename */
+
+ mangle_name(VGAFileMBuf, VGAFileBuf);
+ f = fopen(VGAFileMBuf, "r");
+ if (!f) {
+ /* Not there */
+ NextCharJump = msg_putchar;
+ return;
+ }
+
+ vgadisplayfile(f);
+ fclose(f);
+ msg_initvars();
+}
+
+/*
+ * Getting VGA filename
+ */
+static void msg_filename(uint8_t data)
+{
+ /* <LF> = end of filename */
+ if (data == 0x0A) {
+ msg_viewimage();
+ return;
+ }
+
+ /* Ignore space/control char */
+ if (data > ' ') {
+ if ((char *)VGAFilePtr < (VGAFileBuf + sizeof(VGAFileBuf)))
+ *VGAFilePtr++ = data;
+ }
+}
+
+static void msg_vga(void)
+{
+ NextCharJump = msg_filename;
+ VGAFilePtr = (uint16_t *)VGAFileBuf;
+}
+
+/* Convert ANSI colors to PC display attributes */
+static int convert_to_pcdisplay[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
+
+static void msg_normal(uint8_t data)
+{
+ uint8_t bg, fg;
+
+ /* Write to serial port */
+ if (DisplayMask & 0x4)
+ write_serial(data);
+
+ if (!(DisplayMask & UsingVGA))
+ return; /* Not screen */
+
+ if (!(DisplayCon & 0x01))
+ return;
+
+ fg = convert_to_pcdisplay[(TextAttribute & 0x7)];
+ bg = convert_to_pcdisplay[((TextAttribute >> 4) & 0x7)];
+
+ printf("\033[");
+ if (TextAttribute & 0x40)
+ printf("1;"); /* Foreground bright */
+
+ printf("1;3%dm\033[", fg);
+
+ if (TextAttribute & 0x80)
+ printf("5;"); /* Foreground blink */
+
+ printf("4%dm%c\033[0m", bg, data);
+}
+
+static void msg_modectl(uint8_t data)
+{
+ data &= 0x07;
+ DisplayMask = data;
+ NextCharJump = msg_putchar;
+}
+
+static void msg_putchar(uint8_t ch)
+{
+ /* 10h to 17h are mode controls */
+ if (ch >= 0x10 && ch < 0x18) {
+ msg_modectl(ch);
+ return;
+ }
+
+ switch (ch) {
+ case 0x0F: /* ^O = color code follows */
+ msg_ctrl_o();
+ break;
+ case 0x0D: /* Ignore <CR> */
+ break;
+ case 0x19: /* <EM> = return to text mode */
+ msg_novga();
+ break;
+ case 0x18: /* <CAN> = VGA filename follows */
+ msg_vga();
+ break;
+ default:
+ msg_normal(ch);
+ break;
+ }
+}
+
+/*
+ * Subroutine to initialize variables, also needed after loading
+ * graphics file.
+ */
+void msg_initvars(void)
+{
+ /* Initialize state machine */
+ NextCharJump = msg_putchar;
+}