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# Copyright (C) 2002-2014 Intel Corporation. All Rights Reserved.
#
# This file is part of SEP Development Kit
#
# SEP Development Kit is free software; you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# SEP Development Kit is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with SEP Development Kit; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# As a special exception, you may use this file as part of a free software
# library without restriction. Specifically, if other files instantiate
# templates or use macros or inline functions from this file, or you compile
# this file and link it with other files to produce an executable, this
# file does not by itself cause the resulting executable to be covered by
# the GNU General Public License. This exception does not however
# invalidate any other reasons why the executable file might be covered by
# the GNU General Public License.
#include <asm/dwarf2.h>
#include <asm/calling.h>
#include <asm/msr.h>
.text
#***********************************************************************
#
# SYS_Get_IDT_Base
# Get the IDT Desc address
#
# Entry: pointer to location to store idt Desc
#
# Exit: none
#
# void SYS_Get_IDT_Base(U64 *pIdtDesc);
#
#***********************************************************************
.global SYS_Get_IDT_Base
SYS_Get_IDT_Base:
SIDT (%rdi)
ret
#***********************************************************************
#
# SYS_Get_GDT_Base
# Get the GDT Desc address
#
# Entry: pointer to location to store gdt Desc
#
# Exit: none
#
# void SYS_Get_GDT_Base(U64 *pGdtDesc);
#
#***********************************************************************
.global SYS_Get_GDT_Base
SYS_Get_GDT_Base:
SGDT (%rdi)
ret
#***********************************************************************
#
# SYS_Get_TSC
# Get the current TSC
#
# Entry: pointer to location to store gdt Desc
#
# Exit: none
#
# void SYS_Get_TSC(U64 *tsc);
#
#***********************************************************************
# .global SYS_Get_TSC
#SYS_Get_TSC:
# rdtsc
# ret
#***********************************************************************
#
# SYS_IO_Delay
# Add a short delay to the instruction stream
#
# Entry: none
#
# Exit: none
#
# void SYS_IO_Delay(void);
#
#***********************************************************************
.global SYS_IO_Delay
SYS_IO_Delay:
ret
# ----------------------------------------------------------------------------
# name: SYS_PerfVec_Handler
#
# description: ISR entry for local APIC PERF interrupt vector
#
# Input: n/a
#
# Output: n/a
# ----------------------------------------------------------------------------
.global SYS_Perfvec_Handler
SYS_Perfvec_Handler:
CFI_STARTPROC
pushq %rax // fake an error code...
cld // cause the kernel likes it this way...
SAVE_ALL // Save the world!
movl $MSR_GS_BASE,%ecx // for the moment, do the safe swapgs check
rdmsr
xorl %ebx,%ebx // assume no swapgs (ebx == 0)
testl %edx,%edx
js 1f
swapgs
movl $1,%ebx // ebx == 1 means we did a swapgs
1: movq %rsp,%rdi // pt_regs is the first argument
//
// ebx is zero if no swap, one if swap
// ebx is preserved in C calling convention...
//
// NOTE: the C code is responsible for ACK'ing the APIC!!!
//
call PMI_Interrupt_Handler
//
// Don't want an interrupt while we are doing the swapgs stuff
//
cli
testl %ebx,%ebx
jz 2f
swapgs
2: RESTORE_ALL
popq %rax
iretq
CFI_ENDPROC
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