2fe8fb192f
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
52 lines
1.4 KiB
ArmAsm
52 lines
1.4 KiB
ArmAsm
/* getprocessor() - determine processor type Author: Kees J. Bot */
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/* 26 Jan 1994 */
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#include <machine/asm.h>
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/* int getprocessor(void); */
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/* Return 386, 486, 586, ... */
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ENTRY(getprocessor)
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push %ebp
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movl %esp, %ebp
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andl $0xFFFFFFFC, %esp /* Align stack to avoid AC fault */
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movl $0x00040000, %ecx /* Try to flip the AC bit introduced on the 486 */
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call flip
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movl $386, %eax /* 386 if it didn't react to "flipping" */
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je gotprocessor
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movl $0x00200000, %ecx /* Try to flip the ID bit introduced on the 586 */
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call flip
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movl $486, %eax /* 486 if it didn't react */
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je gotprocessor
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pushf
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pusha /* Save the world */
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movl $1, %eax
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.byte 0x0F, 0xA2 /* CPUID instruction tells the processor type */
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andb $0x0F, %ah /* Extract the family (5, 6, ...) */
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movzbl %ah, %eax
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cmpl $15, %eax /* 15: extended family */
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jne direct
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movl $6, %eax /* Make it 686 */
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direct:
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imull $100, %eax /* 500, 600, ... */
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addl $86, %eax /* 586, 686, ... */
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movl %eax, 7*4(%esp) /* Pass eax through */
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popa
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popf
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gotprocessor:
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leave
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ret
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flip:
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pushf /* Push eflags */
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pop %eax /* eax = eflags */
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movl %eax, %edx /* Save original eflags */
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xorl %ecx, %eax /* Flip the bit to test */
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push %eax /* Push modified eflags value */
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popf /* Load modified eflags register */
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pushf
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pop %eax /* Get it again */
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push %edx
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popf /* Restore original eflags register */
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xorl %edx, %eax /* See if the bit changed */
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testl %ecx, %eax
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ret
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