| /trunk/kernel/arch/ia32/src/asm.S |
|---|
| 147,6 → 147,45 |
| popfl |
| .endm |
| /* |
| * The SYSENTER syscall mechanism can be used for syscalls with |
| * four or fewer arguments. To pass these four arguments, we |
| * use four registers: EDX, ECX, EBX, ESI. The syscall number |
| * is passed in EAX. We use EDI to remember the return address |
| * and EBP to remember the stack. The INT-based syscall mechanism |
| * can actually handle six arguments plus the syscall number |
| * entirely in registers. |
| */ |
| .global sysenter_handler |
| sysenter_handler: |
| pushl %ebp # remember user stack |
| pushl %edi # remember return user address |
| pushl %gs # remember TLS |
| pushl %eax # syscall number |
| subl $8, %esp # unused sixth and fifth argument |
| pushl %esi # fourth argument |
| pushl %ebx # third argument |
| pushl %ecx # second argument |
| pushl %edx # first argument |
| movw $16, %ax |
| movw %ax, %ds |
| movw %ax, %es |
| cld |
| call syscall_handler |
| addl $28, %esp # remove arguments from stack |
| pop %gs # restore TLS |
| pop %edx # prepare return EIP for SYSEXIT |
| pop %ecx # prepare userspace ESP for SYSEXIT |
| sysexit # return to userspace |
| ## Declare interrupt handlers |
| # |
| # Declare interrupt handlers for n interrupt |
| /trunk/kernel/arch/ia32/src/cpu/cpu.c |
|---|
| 42,6 → 42,7 |
| #include <fpu_context.h> |
| #include <arch/smp/apic.h> |
| #include <arch/syscall.h> |
| /* |
| * Identification of CPUs. |
| 123,6 → 124,9 |
| : "i" (CR4_OSFXSR_MASK|(1<<10)) |
| ); |
| } |
| /* Setup fast SYSENTER/SYSEXIT syscalls */ |
| syscall_setup_cpu(); |
| } |
| void cpu_identify(void) |
| /trunk/kernel/arch/ia32/src/syscall.c |
|---|
| 0,0 → 1,53 |
| /* |
| * Copyright (c) 2008 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup ia32 |
| * @{ |
| */ |
| /** @file |
| */ |
| #include <arch/syscall.h> |
| #include <arch/cpu.h> |
| #include <arch/asm.h> |
| #include <arch/types.h> |
| #include <arch/pm.h> |
| /** Enable & setup support for SYSENTER/SYSEXIT */ |
| void syscall_setup_cpu(void) |
| { |
| extern void sysenter_handler(void); |
| /* set kernel mode CS selector */ |
| write_msr(IA32_MSR_SYSENTER_CS, selector(KTEXT_DES)); |
| /* set kernel mode entry point */ |
| write_msr(IA32_MSR_SYSENTER_EIP, (uint32_t) sysenter_handler); |
| } |
| /** @} |
| */ |
| /trunk/kernel/arch/ia32/src/proc/scheduler.c |
|---|
| 58,8 → 58,14 |
| */ |
| void before_thread_runs_arch(void) |
| { |
| CPU->arch.tss->esp0 = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE - |
| uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE - |
| SP_DELTA]; |
| /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */ |
| write_msr(IA32_MSR_SYSENTER_ESP, kstk); |
| /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */ |
| CPU->arch.tss->esp0 = kstk; |
| CPU->arch.tss->ss0 = selector(KDATA_DES); |
| /* Set up TLS in GS register */ |