| 0,0 → 1,124 |
|---|
| # |
| # Copyright (C) 2001-2004 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. |
| # |
| |
| ## very low and hardware-level functions |
| |
| # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word |
| # and 1 means interrupt with error word |
| #define ERROR_WORD_INTERRUPT_LIST 0x00027D00 |
| |
| .text |
| |
| .global xen_callback |
| .global xen_failsafe_callback |
| .global enable_l_apic_in_msr |
| .global memcpy |
| .global memcpy_from_uspace |
| .global memcpy_from_uspace_failover_address |
| .global memcpy_to_uspace |
| .global memcpy_to_uspace_failover_address |
| |
| |
| xen_callback: |
| iret |
| |
| xen_failsafe_callback: |
| iret |
| |
| |
| #define MEMCPY_DST 4 |
| #define MEMCPY_SRC 8 |
| #define MEMCPY_SIZE 12 |
| |
| /** Copy memory to/from userspace. |
| * |
| * This is almost conventional memcpy(). |
| * The difference is that there is a failover part |
| * to where control is returned from a page fault |
| * if the page fault occurs during copy_from_uspace() |
| * or copy_to_uspace(). |
| * |
| * @param MEMCPY_DST(%esp) Destination address. |
| * @param MEMCPY_SRC(%esp) Source address. |
| * @param MEMCPY_SIZE(%esp) Size. |
| * |
| * @return MEMCPY_SRC(%esp) on success and 0 on failure. |
| */ |
| memcpy: |
| memcpy_from_uspace: |
| memcpy_to_uspace: |
| movl %edi, %edx /* save %edi */ |
| movl %esi, %eax /* save %esi */ |
| |
| movl MEMCPY_SIZE(%esp), %ecx |
| shrl $2, %ecx /* size / 4 */ |
| |
| movl MEMCPY_DST(%esp), %edi |
| movl MEMCPY_SRC(%esp), %esi |
| |
| rep movsl /* copy as much as possible word by word */ |
| |
| movl MEMCPY_SIZE(%esp), %ecx |
| andl $3, %ecx /* size % 4 */ |
| jz 0f |
| |
| rep movsb /* copy the rest byte by byte */ |
| |
| 0: |
| movl %edx, %edi |
| movl %eax, %esi |
| movl MEMCPY_SRC(%esp), %eax /* MEMCPY_SRC(%esp), success */ |
| ret |
| |
| /* |
| * We got here from as_page_fault() after the memory operations |
| * above had caused a page fault. |
| */ |
| memcpy_from_uspace_failover_address: |
| memcpy_to_uspace_failover_address: |
| movl %edx, %edi |
| movl %eax, %esi |
| xorl %eax, %eax /* return 0, failure */ |
| ret |
| |
| |
| ## Enable local APIC |
| # |
| # Enable local APIC in MSR. |
| # |
| enable_l_apic_in_msr: |
| push %eax |
| |
| movl $0x1b, %ecx |
| rdmsr |
| orl $(1<<11),%eax |
| orl $(0xfee00000),%eax |
| wrmsr |
| |
| pop %eax |
| ret |