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001 /* Copyright (C) 2000-2004, The KOS team !! 001 /* Copyright (C) 2005 David Decotigny 002 Copyright (C) 1999 Free Software Foundatio !! 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 >> 021 >> 022 #include "segment.h" >> 023 020 024 021 .file "cpu_context_switch.S" 025 .file "cpu_context_switch.S" 022 026 023 .text 027 .text 024 028 >> 029 >> 030 /** >> 031 * C Function called by the routines below in order to tell the CPU >> 032 * where will be the kernel stack (needed by the interrupt handlers) >> 033 * when next_ctxt will come back into kernel mode. >> 034 * >> 035 * void sos_cpu_context_update_kernel_tss(struct sos_cpu_state *next_ctxt) >> 036 * >> 037 * @see end of cpu_context.c >> 038 */ >> 039 .extern sos_cpu_context_update_kernel_tss >> 040 025 041 026 .globl sos_cpu_kstate_switch !! 042 .globl sos_cpu_context_switch 027 .type sos_cpu_kstate_switch, @function !! 043 .type sos_cpu_context_switch, @function 028 sos_cpu_kstate_switch: !! 044 sos_cpu_context_switch: 029 // arg2= to_context -- esp+64 045 // arg2= to_context -- esp+64 030 // arg1= from_context -- esp+60 046 // arg1= from_context -- esp+60 031 // caller ip -- esp+56 047 // caller ip -- esp+56 032 pushf // (eflags) esp+52 048 pushf // (eflags) esp+52 033 pushl %cs // (cs) esp+48 049 pushl %cs // (cs) esp+48 034 pushl $resume_pc // (ip) esp+44 050 pushl $resume_pc // (ip) esp+44 035 pushl $0 // (error code) esp+40 051 pushl $0 // (error code) esp+40 036 pushl %ebp // esp+36 052 pushl %ebp // esp+36 037 pushl %edi // esp+32 053 pushl %edi // esp+32 038 pushl %esi // esp+28 054 pushl %esi // esp+28 039 pushl %edx // esp+24 055 pushl %edx // esp+24 040 pushl %ecx // esp+20 056 pushl %ecx // esp+20 041 pushl %ebx // esp+16 057 pushl %ebx // esp+16 042 pushl %eax // esp+12 058 pushl %eax // esp+12 043 subl $2, %esp // (alignment) esp+10 059 subl $2, %esp // (alignment) esp+10 044 pushw %ss // esp+8 060 pushw %ss // esp+8 045 pushw %ds // esp+6 061 pushw %ds // esp+6 046 pushw %es // esp+4 062 pushw %es // esp+4 047 pushw %fs // esp+2 063 pushw %fs // esp+2 048 pushw %gs // esp 064 pushw %gs // esp 049 065 050 /* 066 /* 051 * Now that the original eax/ebx are store, !! 067 * Now that the original eax/ebx are stored, we can use them safely 052 */ 068 */ 053 069 054 /* Store the address of the saved context */ 070 /* Store the address of the saved context */ 055 movl 60(%esp), %ebx 071 movl 60(%esp), %ebx 056 movl %esp, (%ebx) 072 movl %esp, (%ebx) 057 073 058 /* This is the proper context switch ! We ch 074 /* This is the proper context switch ! We change the stack here */ 059 movl 64(%esp), %esp 075 movl 64(%esp), %esp 060 076 >> 077 /* Prepare kernel TSS in case we are switching to a user thread: we >> 078 make sure that we will come back into the kernel at a correct >> 079 stack location */ >> 080 pushl %esp /* Pass the location of the context we are >> 081 restoring to the function */ >> 082 call sos_cpu_context_update_kernel_tss >> 083 addl $4, %esp >> 084 061 /* Restore the CPU context */ 085 /* Restore the CPU context */ 062 popw %gs 086 popw %gs 063 popw %fs 087 popw %fs 064 popw %es 088 popw %es 065 popw %ds 089 popw %ds 066 popw %ss 090 popw %ss 067 addl $2,%esp 091 addl $2,%esp 068 popl %eax 092 popl %eax 069 popl %ebx 093 popl %ebx 070 popl %ecx 094 popl %ecx 071 popl %edx 095 popl %edx 072 popl %esi 096 popl %esi 073 popl %edi 097 popl %edi 074 popl %ebp 098 popl %ebp 075 addl $4, %esp /* Ignore "error code" */ 099 addl $4, %esp /* Ignore "error code" */ 076 100 077 /* This restores the eflags, the cs and the 101 /* This restores the eflags, the cs and the eip registers */ 078 iret /* equivalent to: popfl ; ret */ 102 iret /* equivalent to: popfl ; ret */ 079 103 080 resume_pc: 104 resume_pc: 081 // Same context as that when sos_cpu_k !! 105 // Same context as that when sos_cpu_context_switch got called 082 // arg2= to_context -- esp+8 106 // arg2= to_context -- esp+8 083 // arg1= from_context -- esp+4 107 // arg1= from_context -- esp+4 084 // caller ip -- esp 108 // caller ip -- esp 085 ret 109 ret 086 110 087 111 088 112 089 /* ------------------------- */ 113 /* ------------------------- */ 090 .globl sos_cpu_kstate_exit_to !! 114 .globl sos_cpu_context_exit_to 091 .type sos_cpu_kstate_exit_to, @function !! 115 .type sos_cpu_context_exit_to, @function 092 sos_cpu_kstate_exit_to: !! 116 sos_cpu_context_exit_to: 093 // arg3= reclaiming_arg -- esp+12 117 // arg3= reclaiming_arg -- esp+12 094 // arg2= reclaiming_func -- esp+8 118 // arg2= reclaiming_func -- esp+8 095 // arg1= to_context -- esp+4 119 // arg1= to_context -- esp+4 096 // caller ip -- esp 120 // caller ip -- esp 097 121 098 /* Store the current SP in a temporary regis 122 /* Store the current SP in a temporary register */ 099 movl %esp, %eax 123 movl %esp, %eax 100 124 101 /* This is the proper context switch ! We ch 125 /* This is the proper context switch ! We change the stack here */ 102 movl 4(%eax), %esp 126 movl 4(%eax), %esp 103 127 104 /* Call the reclaiming function (remember: t 128 /* Call the reclaiming function (remember: the old frame address 105 is stored in eax) */ 129 is stored in eax) */ 106 pushl 12(%eax) 130 pushl 12(%eax) 107 call *8(%eax) 131 call *8(%eax) 108 addl $4, %esp 132 addl $4, %esp 109 133 >> 134 /* Prepare kernel TSS in case we are switching to a user thread: we >> 135 make sure that we will come back into the kernel at a correct >> 136 stack location */ >> 137 pushl %esp /* Pass the location of the context we are >> 138 restoring to the function */ >> 139 call sos_cpu_context_update_kernel_tss >> 140 addl $4, %esp >> 141 110 /* Restore the CPU context */ 142 /* Restore the CPU context */ 111 popw %gs 143 popw %gs 112 popw %fs 144 popw %fs 113 popw %es 145 popw %es 114 popw %ds 146 popw %ds 115 popw %ss 147 popw %ss 116 addl $2,%esp 148 addl $2,%esp 117 popl %eax 149 popl %eax 118 popl %ebx 150 popl %ebx 119 popl %ecx 151 popl %ecx 120 popl %edx 152 popl %edx 121 popl %esi 153 popl %esi 122 popl %edi 154 popl %edi 123 popl %ebp 155 popl %ebp 124 addl $4, %esp /* Ignore "error code" */ 156 addl $4, %esp /* Ignore "error code" */ 125 157 126 /* This restores the eflags, the cs and the 158 /* This restores the eflags, the cs and the eip registers */ 127 iret /* equivalent to: popfl ; ret */ 159 iret /* equivalent to: popfl ; ret */ 128 <<
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