machine_routines_asm.s [plain text]
/*
* Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the
* License may not be used to create, or enable the creation or
* redistribution of, unlawful or unlicensed copies of an Apple operating
* system, or to circumvent, violate, or enable the circumvention or
* violation of, any terms of an Apple operating system software license
* agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_OSREFERENCE_HEADER_END@
*/
#include <i386/asm.h>
#include <i386/proc_reg.h>
#include <i386/eflags.h>
#include <i386/postcode.h>
#include <i386/apic.h>
#include <assym.s>
#define PA(addr) (addr)
#define VA(addr) (addr)
/*
* GAS won't handle an intersegment jump with a relocatable offset.
*/
#define LJMP(segment,address) \
.byte 0xea .word segment
/*
** ml_get_timebase()
**
** Entry - %esp contains pointer to 64 bit structure.
**
** Exit - 64 bit structure filled in.
**
*/
ENTRY(ml_get_timebase)
movl S_ARG0, %ecx
rdtsc
movl %edx, 0(%ecx)
movl %eax, 4(%ecx)
ret
/*
* Convert between various timer units
*
* uint64_t tmrCvt(uint64_t time, uint64_t *conversion)
*
* This code converts 64-bit time units to other units.
* For example, the TSC is converted to HPET units.
*
* Time is a 64-bit integer that is some number of ticks.
* Conversion is 64-bit fixed point number which is composed
* of a 32 bit integer and a 32 bit fraction.
*
* The time ticks are multiplied by the conversion factor. The
* calculations are done as a 128-bit value but both the high
* and low words are dropped. The high word is overflow and the
* low word is the fraction part of the result.
*
* We return a 64-bit value.
*
* Note that we can use this function to multiply 2 conversion factors.
* We do this in order to calculate the multiplier used to convert
* directly between any two units.
*
*/
.globl EXT(tmrCvt)
.align FALIGN
LEXT(tmrCvt)
pushl %ebp // Save a volatile
movl %esp,%ebp // Get the parameters - 8
pushl %ebx // Save a volatile
pushl %esi // Save a volatile
pushl %edi // Save a volatile
// %ebp + 8 - low-order ts
// %ebp + 12 - high-order ts
// %ebp + 16 - low-order cvt
// %ebp + 20 - high-order cvt
movl 8(%ebp),%eax // Get low-order ts
mull 16(%ebp) // Multiply by low-order conversion
movl %edx,%edi // Need to save only the high order part
movl 12(%ebp),%eax // Get the high-order ts
mull 16(%ebp) // Multiply by low-order conversion
addl %eax,%edi // Add in the overflow from the low x low calculation
adcl $0,%edx // Add in any overflow to high high part
movl %edx,%esi // Save high high part
// We now have the upper 64 bits of the 96 bit multiply of ts and the low half of cvt
// in %esi:%edi
movl 8(%ebp),%eax // Get low-order ts
mull 20(%ebp) // Multiply by high-order conversion
movl %eax,%ebx // Need to save the low order part
movl %edx,%ecx // Need to save the high order part
movl 12(%ebp),%eax // Get the high-order ts
mull 20(%ebp) // Multiply by high-order conversion
// Now have %ecx:%ebx as low part of high low and %edx:%eax as high part of high high
// We don't care about the highest word since it is overflow
addl %edi,%ebx // Add the low words
adcl %ecx,%esi // Add in the high plus carry from low
addl %eax,%esi // Add in the rest of the high
movl %ebx,%eax // Pass back low word
movl %esi,%edx // and the high word
popl %edi // Restore a volatile
popl %esi // Restore a volatile
popl %ebx // Restore a volatile
popl %ebp // Restore a volatile
ret // Leave...
.globl EXT(rtc_nanotime_store)
.align FALIGN
LEXT(rtc_nanotime_store)
push %ebp
mov %esp,%ebp
mov 32(%ebp),%edx
mov 8(%ebp),%eax
mov %eax,RNT_TSC_BASE(%edx)
mov 12(%ebp),%eax
mov %eax,RNT_TSC_BASE+4(%edx)
mov 24(%ebp),%eax
mov %eax,RNT_SCALE(%edx)
mov 28(%ebp),%eax
mov %eax,RNT_SHIFT(%edx)
mov 16(%ebp),%eax
mov %eax,RNT_NS_BASE(%edx)
mov 20(%ebp),%eax
mov %eax,RNT_NS_BASE+4(%edx)
pop %ebp
ret
.globl EXT(rtc_nanotime_load)
.align FALIGN
LEXT(rtc_nanotime_load)
push %ebp
mov %esp,%ebp
mov 8(%ebp),%ecx
mov 12(%ebp),%edx
mov RNT_TSC_BASE(%ecx),%eax
mov %eax,RNT_TSC_BASE(%edx)
mov RNT_TSC_BASE+4(%ecx),%eax
mov %eax,RNT_TSC_BASE+4(%edx)
mov RNT_SCALE(%ecx),%eax
mov %eax,RNT_SCALE(%edx)
mov RNT_SHIFT(%ecx),%eax
mov %eax,RNT_SHIFT(%edx)
mov RNT_NS_BASE(%ecx),%eax
mov %eax,RNT_NS_BASE(%edx)
mov RNT_NS_BASE+4(%ecx),%eax
mov %eax,RNT_NS_BASE+4(%edx)
pop %ebp
ret