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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 Copyright (C) 2000-2004, The KOS team 002 Copyright (C) 2000-2004, The KOS team 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 #define ASM_SOURCE 1 019 #define ASM_SOURCE 1 020 020 021 021 022 #include "segment.h" 022 #include "segment.h" 023 023 024 024 025 .file "cpu_context_switch.S" 025 .file "cpu_context_switch.S" 026 026 027 .text 027 .text 028 028 029 029 030 /** 030 /** 031 * C Function called by the routines below in 031 * C Function called by the routines below in order to tell the CPU 032 * where will be the kernel stack (needed by t 032 * where will be the kernel stack (needed by the interrupt handlers) 033 * when next_ctxt will come back into kernel m 033 * when next_ctxt will come back into kernel mode. 034 * 034 * 035 * void sos_cpu_context_update_kernel_tss(stru 035 * void sos_cpu_context_update_kernel_tss(struct sos_cpu_state *next_ctxt) 036 * 036 * 037 * @see end of cpu_context.c 037 * @see end of cpu_context.c 038 */ 038 */ 039 .extern sos_cpu_context_update_kernel_tss 039 .extern sos_cpu_context_update_kernel_tss 040 040 041 041 042 .globl sos_cpu_context_switch 042 .globl sos_cpu_context_switch 043 .type sos_cpu_context_switch, @function 043 .type sos_cpu_context_switch, @function 044 sos_cpu_context_switch: 044 sos_cpu_context_switch: 045 // arg2= to_context -- esp+64 045 // arg2= to_context -- esp+64 046 // arg1= from_context -- esp+60 046 // arg1= from_context -- esp+60 047 // caller ip -- esp+56 047 // caller ip -- esp+56 048 pushf // (eflags) esp+52 048 pushf // (eflags) esp+52 049 pushl %cs // (cs) esp+48 049 pushl %cs // (cs) esp+48 050 pushl $resume_pc // (ip) esp+44 050 pushl $resume_pc // (ip) esp+44 051 pushl $0 // (error code) esp+40 051 pushl $0 // (error code) esp+40 052 pushl %ebp // esp+36 052 pushl %ebp // esp+36 053 pushl %edi // esp+32 053 pushl %edi // esp+32 054 pushl %esi // esp+28 054 pushl %esi // esp+28 055 pushl %edx // esp+24 055 pushl %edx // esp+24 056 pushl %ecx // esp+20 056 pushl %ecx // esp+20 057 pushl %ebx // esp+16 057 pushl %ebx // esp+16 058 pushl %eax // esp+12 058 pushl %eax // esp+12 059 subl $2, %esp // (alignment) esp+10 059 subl $2, %esp // (alignment) esp+10 060 pushw %ss // esp+8 060 pushw %ss // esp+8 061 pushw %ds // esp+6 061 pushw %ds // esp+6 062 pushw %es // esp+4 062 pushw %es // esp+4 063 pushw %fs // esp+2 063 pushw %fs // esp+2 064 pushw %gs // esp 064 pushw %gs // esp 065 065 066 /* 066 /* 067 * Now that the original eax/ebx are stored, 067 * Now that the original eax/ebx are stored, we can use them safely 068 */ 068 */ 069 069 070 /* Store the address of the saved context */ 070 /* Store the address of the saved context */ 071 movl 60(%esp), %ebx 071 movl 60(%esp), %ebx 072 movl %esp, (%ebx) 072 movl %esp, (%ebx) 073 073 074 /* This is the proper context switch ! We ch 074 /* This is the proper context switch ! We change the stack here */ 075 movl 64(%esp), %esp 075 movl 64(%esp), %esp 076 076 077 /* Prepare kernel TSS in case we are switchi 077 /* Prepare kernel TSS in case we are switching to a user thread: we 078 make sure that we will come back into the 078 make sure that we will come back into the kernel at a correct 079 stack location */ 079 stack location */ 080 pushl %esp /* Pass the location of the conte 080 pushl %esp /* Pass the location of the context we are 081 restoring to the function */ 081 restoring to the function */ 082 call sos_cpu_context_update_kernel_tss 082 call sos_cpu_context_update_kernel_tss 083 addl $4, %esp 083 addl $4, %esp 084 084 085 /* Restore the CPU context */ 085 /* Restore the CPU context */ 086 popw %gs 086 popw %gs 087 popw %fs 087 popw %fs 088 popw %es 088 popw %es 089 popw %ds 089 popw %ds 090 popw %ss 090 popw %ss 091 addl $2,%esp 091 addl $2,%esp 092 popl %eax 092 popl %eax 093 popl %ebx 093 popl %ebx 094 popl %ecx 094 popl %ecx 095 popl %edx 095 popl %edx 096 popl %esi 096 popl %esi 097 popl %edi 097 popl %edi 098 popl %ebp 098 popl %ebp 099 addl $4, %esp /* Ignore "error code" */ 099 addl $4, %esp /* Ignore "error code" */ 100 100 101 /* This restores the eflags, the cs and the 101 /* This restores the eflags, the cs and the eip registers */ 102 iret /* equivalent to: popfl ; ret */ 102 iret /* equivalent to: popfl ; ret */ 103 103 104 resume_pc: 104 resume_pc: 105 // Same context as that when sos_cpu_c 105 // Same context as that when sos_cpu_context_switch got called 106 // arg2= to_context -- esp+8 106 // arg2= to_context -- esp+8 107 // arg1= from_context -- esp+4 107 // arg1= from_context -- esp+4 108 // caller ip -- esp 108 // caller ip -- esp 109 ret 109 ret 110 110 111 111 112 112 113 /* ------------------------- */ 113 /* ------------------------- */ 114 .globl sos_cpu_context_exit_to 114 .globl sos_cpu_context_exit_to 115 .type sos_cpu_context_exit_to, @function 115 .type sos_cpu_context_exit_to, @function 116 sos_cpu_context_exit_to: 116 sos_cpu_context_exit_to: 117 // arg3= reclaiming_arg -- esp+12 117 // arg3= reclaiming_arg -- esp+12 118 // arg2= reclaiming_func -- esp+8 118 // arg2= reclaiming_func -- esp+8 119 // arg1= to_context -- esp+4 119 // arg1= to_context -- esp+4 120 // caller ip -- esp 120 // caller ip -- esp 121 121 122 /* Store the current SP in a temporary regis 122 /* Store the current SP in a temporary register */ 123 movl %esp, %eax 123 movl %esp, %eax 124 124 125 /* This is the proper context switch ! We ch 125 /* This is the proper context switch ! We change the stack here */ 126 movl 4(%eax), %esp 126 movl 4(%eax), %esp 127 127 128 /* Call the reclaiming function (remember: t 128 /* Call the reclaiming function (remember: the old frame address 129 is stored in eax) */ 129 is stored in eax) */ 130 pushl 12(%eax) 130 pushl 12(%eax) 131 call *8(%eax) 131 call *8(%eax) 132 addl $4, %esp 132 addl $4, %esp 133 133 134 /* Prepare kernel TSS in case we are switchi 134 /* Prepare kernel TSS in case we are switching to a user thread: we 135 make sure that we will come back into the 135 make sure that we will come back into the kernel at a correct 136 stack location */ 136 stack location */ 137 pushl %esp /* Pass the location of the conte 137 pushl %esp /* Pass the location of the context we are 138 restoring to the function */ 138 restoring to the function */ 139 call sos_cpu_context_update_kernel_tss 139 call sos_cpu_context_update_kernel_tss 140 addl $4, %esp 140 addl $4, %esp 141 141 142 /* Restore the CPU context */ 142 /* Restore the CPU context */ 143 popw %gs 143 popw %gs 144 popw %fs 144 popw %fs 145 popw %es 145 popw %es 146 popw %ds 146 popw %ds 147 popw %ss 147 popw %ss 148 addl $2,%esp 148 addl $2,%esp 149 popl %eax 149 popl %eax 150 popl %ebx 150 popl %ebx 151 popl %ecx 151 popl %ecx 152 popl %edx 152 popl %edx 153 popl %esi 153 popl %esi 154 popl %edi 154 popl %edi 155 popl %ebp 155 popl %ebp 156 addl $4, %esp /* Ignore "error code" */ 156 addl $4, %esp /* Ignore "error code" */ 157 157 158 /* This restores the eflags, the cs and the 158 /* This restores the eflags, the cs and the eip registers */ 159 iret /* equivalent to: popfl ; ret */ 159 iret /* equivalent to: popfl ; ret */
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