minix/lib/libminlib/i386/_cpuid.S
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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ArmAsm

/* _cpuid() - interface to cpuid instruction */
/* void _cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx); */
/* 0 for OK, nonzero for unsupported */
#include <machine/asm.h>
ENTRY(_cpuid)
/* save work registers */
push %ebp
push %ebx
/* set eax parameter to cpuid and execute cpuid */
movl 12(%esp), %ebp
mov (%ebp), %eax
movl 16(%esp), %ebp
mov (%ebp), %ebx
movl 20(%esp), %ebp
mov (%ebp), %ecx
movl 24(%esp), %ebp
mov (%ebp), %edx
.byte 0x0F, 0xA2 /* CPUID */
/* store results in pointer arguments */
movl 12(%esp), %ebp
movl %eax, (%ebp)
movl 16(%esp), %ebp
movl %ebx, (%ebp)
movl 20(%esp), %ebp
movl %ecx, (%ebp)
movl 24(%esp), %ebp
movl %edx, (%ebp)
/* restore registers */
pop %ebx
pop %ebp
ret