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[metal] Some minor fixes and tweaks (#933)

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* [metal] Ensure DF is clear when calling C from exception handler
* [metal] Mark some internal routines and declarations as `@internal`
* [metal] Fix crash under UEFI when command line string is NULL
* [metal] Fix argc & argv[] setting, & VM page freeing, for UEFI

Part of the memory occupied by the argv[] contents was
erroneously used for page tables & then later erroneously
freed.  The symptom was that argv[0] would show up as an
empty string ("").
This commit is contained in:
tkchia 2023-11-15 07:26:59 +08:00 • committed by GitHub
parent 1c2e7c1333
commit eea601f346
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 76 additions and 20 deletions
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18
libc/vga/tty.greg.c
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@ -33,6 +33,7 @@
#ifdef __x86_64__
/**
* @internal
* @fileoverview ECMA-48 / VT100 video terminal implementation for bare
* metal VGA.
*
@ -325,6 +326,7 @@ static void TtySetCodepage(struct Tty *tty, char id) {
}
/**
* @internal
* Map the given direct color value to one of the 16 basic foreground colors
* or one of the 16 background colors.
*
@ -344,6 +346,7 @@ static uint8_t TtyGetTextColor(TtyCanvasColor color) {
}
/**
* @internal
* Map the currently active foreground & background colors & terminal
* configuration to a VGA text character attribute byte.
*
@ -794,12 +797,18 @@ static void TtyCsiN(struct Tty *tty) {
}
}
/** Create a direct color pixel value. */
/**
* @internal
* Create a direct color pixel value.
*/
static TtyCanvasColor TtyMapTrueColor(uint8_t r, uint8_t g, uint8_t b) {
return (TtyCanvasColor){.bgr.r = r, .bgr.g = g, .bgr.b = b, .bgr.x = 0xff};
}
/** Map the given 256-color code to a direct color. */
/**
* @internal
* Map the given 256-color code to a direct color.
*/
static TtyCanvasColor TtyMapXtermColor(uint8_t color) {
uint8_t r, g, b;
if (color < 8) {
@ -822,7 +831,10 @@ static TtyCanvasColor TtyMapXtermColor(uint8_t color) {
return TtyMapTrueColor(r, g, b);
}
/** Map the given ECMA-48 / VT100 SGR color code to a direct color. */
/**
* @internal
* Map the given ECMA-48 / VT100 SGR color code to a direct color.
*/
static TtyCanvasColor TtyMapEcma48Color(uint8_t color) {
return TtyMapXtermColor(color % 16);
}