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Add basic character output for VGA graphics mode console (#649)

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* Test output of colors for VGA graphics modes in examples/vga.c
* [metal] Character output in VGA graphics modes is mostly working
* [metal] Mention magic key to switch video mode, at bootup
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tkchia 2022-10-05 21:46:50 +08:00 • committed by GitHub
parent b75a4654cf
commit edb8fef06c
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8 changed files with 2059 additions and 324 deletions
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10
libc/integral/c.inc
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@ -448,6 +448,16 @@ typedef struct {
#endif
#endif
#ifndef unrollloops
#if !defined(__STRICT_ANSI__) && \
((__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 407 || \
__has_attribute(__optimize__))
#define unrollloops __attribute__((__optimize__("unroll-loops")))
#else
#define unrollloops
#endif
#endif
#ifndef returnstwice
#if !defined(__STRICT_ANSI__) && \
(__has_attribute(__returns_twice__) || \