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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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29
libc/vga/vga.internal.h
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@ -2,11 +2,20 @@
#define COSMOPOLITAN_LIBC_VGA_VGA_INTERNAL_H_
#include "libc/runtime/mman.internal.h"
/** Preferred width of the video screen, in character units. */
/**
* @internal
* Preferred width of the video screen, in character units.
*/
#define VGA_PREFER_TTY_HEIGHT 30
/** Preferred width of the video screen, in character units. */
/**
* @internal
* Preferred width of the video screen, in character units.
*/
#define VGA_PREFER_TTY_WIDTH 80
/** Assumed height of each character in pixels, in graphics modes. */
/**
* @internal
* Assumed height of each character in pixels, in graphics modes.
*/
#define VGA_ASSUME_CHAR_HEIGHT_PX 16
/** Assumed width of each character in pixels, in graphics modes. */
#define VGA_ASSUME_CHAR_WIDTH_PX 8
@ -18,6 +27,7 @@
*/
/**
* @internal
* If VGA_USE_WCS is defined, the tty code can maintain an array of the
* Unicode characters "underlying" the 8-bit (or 9-bit) characters that are
* actually displayed on the text screen. This Unicode character
@ -33,6 +43,7 @@
*/
#undef VGA_USE_WCS
/**
* @internal
* The VGA hardware can be configured — via the IBM BIOS, or via port I/O —
* to either support blinking characters, or support the use of bright
* background colors, but not both. There is a hardware setting that
@ -67,6 +78,7 @@
*/
#undef VGA_USE_BLINK
/**
* @internal
* If VGA_PERSNICKETY_STATUS is defined, then when deciding how to return
* status response codes (e.g. "\e[0n"), the tty code will pay attention to
* the terminal's termios mode (TODO). If undefined, the tty code will
@ -75,7 +87,10 @@
*/
#undef VGA_PERSNICKETY_STATUS
/* Flags which are passed to _StartTty(). */
/**
* @internal
* Flags which are passed to _StartTty().
*/
#define kTtyAllocWcs \
0x01 /* allocate Unicode character array \
(if VGA_USE_WCS also defined) */
@ -85,6 +100,7 @@
to show system messages */
/**
* @internal
* Flags for Tty::pr. These govern properties of individual character cells.
*/
#define kTtyFg 0x0001
@ -102,6 +118,7 @@
#define kTtyConceal 0x1000
/**
* @internal
* Flags for Tty::conf. These govern the current state of the teletypewriter
* as a whole.
*/
@ -153,6 +170,10 @@ typedef union {
typedef TtyBgrxColor TtyCanvasColor;
struct Tty;
/**
* @internal
* Video console object type.
*/
struct Tty {
/**
* Cursor position. (y, x) = (0, 0) means the cursor is on the top left