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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny >> 002 Copyright (C) 1999 Free Software Foundation, Inc. 002 003 003 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 007 008 008 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 012 GNU General Public License for more details. 012 013 013 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 USA. 017 */ 018 */ 018 #include "idt.h" 019 #include "idt.h" 019 #include "i8259.h" 020 #include "i8259.h" 020 021 021 #include "irq.h" 022 #include "irq.h" 022 023 023 /** array of IRQ wrappers, defined in irq_wrap !! 024 /* array of IRQ wrappers, defined in irq_wrappers.S */ 024 extern sos_vaddr_t sos_irq_wrapper_array[SOS_I 025 extern sos_vaddr_t sos_irq_wrapper_array[SOS_IRQ_NUM]; 025 026 026 /** arrays of IRQ handlers, shared with irq_wr !! 027 /* arrays of IRQ handlers, shared with irq_wrappers.S */ 027 sos_irq_handler_t sos_irq_handler_array[SOS_IR 028 sos_irq_handler_t sos_irq_handler_array[SOS_IRQ_NUM] = { NULL, }; 028 029 029 /** Number of interrupt handlers that are curr << 030 sos_ui32_t sos_irq_nested_level_counter; << 031 030 032 sos_ret_t sos_irq_subsystem_setup(void) !! 031 sos_ret_t sos_irq_setup(void) 033 { 032 { 034 sos_irq_nested_level_counter = 0; !! 033 return sos_i8259_setup(); 035 return sos_i8259_subsystem_setup(); << 036 } 034 } 037 035 038 036 039 sos_ret_t sos_irq_set_routine(int irq_level, 037 sos_ret_t sos_irq_set_routine(int irq_level, 040 sos_irq_handler_ 038 sos_irq_handler_t routine) 041 { 039 { 042 sos_ret_t retval; 040 sos_ret_t retval; 043 sos_ui32_t flags; 041 sos_ui32_t flags; 044 042 045 if ((irq_level < 0) || (irq_level >= SOS_IRQ 043 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 046 return -SOS_EINVAL; 044 return -SOS_EINVAL; 047 045 048 sos_disable_IRQs(flags); 046 sos_disable_IRQs(flags); 049 047 050 retval = SOS_OK; 048 retval = SOS_OK; 051 049 052 /* Set the irq routine to be called by the I 050 /* Set the irq routine to be called by the IRQ wrapper */ 053 sos_irq_handler_array[irq_level] = routine; 051 sos_irq_handler_array[irq_level] = routine; 054 052 055 /* If the irq is to be enabled, update the I 053 /* If the irq is to be enabled, update the IDT with the IRQ 056 wrapper */ 054 wrapper */ 057 if (routine != NULL) 055 if (routine != NULL) 058 { 056 { 059 retval 057 retval 060 = sos_idt_set_handler(SOS_IRQ_BASE + i 058 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 061 (sos_vaddr_t) so 059 (sos_vaddr_t) sos_irq_wrapper_array[irq_level], 062 0 /* CPL0 routin 060 0 /* CPL0 routine */); 063 /* A problem occured */ 061 /* A problem occured */ 064 if (retval != SOS_OK) 062 if (retval != SOS_OK) 065 sos_irq_handler_array[irq_level] = NUL 063 sos_irq_handler_array[irq_level] = NULL; 066 } 064 } 067 else /* Disable this idt entry */ 065 else /* Disable this idt entry */ 068 { 066 { 069 retval 067 retval 070 = sos_idt_set_handler(SOS_IRQ_BASE + i 068 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 071 (sos_vaddr_t)NUL 069 (sos_vaddr_t)NULL /* Disable IDTE */, 072 0 /* Don't care 070 0 /* Don't care */); 073 } 071 } 074 072 075 /* Update the PIC only if an IRQ handler has 073 /* Update the PIC only if an IRQ handler has been set */ 076 if (sos_irq_handler_array[irq_level] != NULL 074 if (sos_irq_handler_array[irq_level] != NULL) 077 sos_i8259_enable_irq_line(irq_level); 075 sos_i8259_enable_irq_line(irq_level); 078 else 076 else 079 sos_i8259_disable_irq_line(irq_level); 077 sos_i8259_disable_irq_line(irq_level); 080 078 081 sos_restore_IRQs(flags); 079 sos_restore_IRQs(flags); 082 return retval; 080 return retval; 083 } 081 } 084 082 085 083 086 sos_irq_handler_t sos_irq_get_routine(int irq_ 084 sos_irq_handler_t sos_irq_get_routine(int irq_level) 087 { 085 { 088 if ((irq_level < 0) || (irq_level >= SOS_IRQ 086 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 089 return NULL; 087 return NULL; 090 088 091 /* Expected to be atomic */ 089 /* Expected to be atomic */ 092 return sos_irq_handler_array[irq_level]; 090 return sos_irq_handler_array[irq_level]; 093 } << 094 << 095 << 096 sos_ui32_t sos_irq_get_nested_level() << 097 { << 098 /* No need to disable interrupts here */ << 099 return sos_irq_nested_level_counter; << 100 } 091 }
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