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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 Copyright (C) 1999 Free Software Foundatio 002 Copyright (C) 1999 Free Software Foundation, Inc. 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 #include "idt.h" 019 #include "idt.h" 020 #include "i8259.h" 020 #include "i8259.h" 021 021 022 #include "irq.h" 022 #include "irq.h" 023 023 024 /** array of IRQ wrappers, defined in irq_wrap !! 024 /* array of IRQ wrappers, defined in irq_wrappers.S */ 025 extern sos_vaddr_t sos_irq_wrapper_array[SOS_I 025 extern sos_vaddr_t sos_irq_wrapper_array[SOS_IRQ_NUM]; 026 026 027 /** arrays of IRQ handlers, shared with irq_wr !! 027 /* arrays of IRQ handlers, shared with irq_wrappers.S */ 028 sos_irq_handler_t sos_irq_handler_array[SOS_IR 028 sos_irq_handler_t sos_irq_handler_array[SOS_IRQ_NUM] = { NULL, }; 029 029 030 /** Number of interrupt handlers that are curr << 031 sos_ui32_t sos_irq_nested_level_counter; << 032 030 033 sos_ret_t sos_irq_subsystem_setup(void) !! 031 sos_ret_t sos_irq_setup(void) 034 { 032 { 035 sos_irq_nested_level_counter = 0; !! 033 return sos_i8259_setup(); 036 return sos_i8259_subsystem_setup(); << 037 } 034 } 038 035 039 036 040 sos_ret_t sos_irq_set_routine(int irq_level, 037 sos_ret_t sos_irq_set_routine(int irq_level, 041 sos_irq_handler_ 038 sos_irq_handler_t routine) 042 { 039 { 043 sos_ret_t retval; 040 sos_ret_t retval; 044 sos_ui32_t flags; 041 sos_ui32_t flags; 045 042 046 if ((irq_level < 0) || (irq_level >= SOS_IRQ 043 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 047 return -SOS_EINVAL; 044 return -SOS_EINVAL; 048 045 049 sos_disable_IRQs(flags); 046 sos_disable_IRQs(flags); 050 047 051 retval = SOS_OK; 048 retval = SOS_OK; 052 049 053 /* Set the irq routine to be called by the I 050 /* Set the irq routine to be called by the IRQ wrapper */ 054 sos_irq_handler_array[irq_level] = routine; 051 sos_irq_handler_array[irq_level] = routine; 055 052 056 /* If the irq is to be enabled, update the I 053 /* If the irq is to be enabled, update the IDT with the IRQ 057 wrapper */ 054 wrapper */ 058 if (routine != NULL) 055 if (routine != NULL) 059 { 056 { 060 retval 057 retval 061 = sos_idt_set_handler(SOS_IRQ_BASE + i 058 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 062 (sos_vaddr_t) so 059 (sos_vaddr_t) sos_irq_wrapper_array[irq_level], 063 0 /* CPL0 routin 060 0 /* CPL0 routine */); 064 /* A problem occured */ 061 /* A problem occured */ 065 if (retval != SOS_OK) 062 if (retval != SOS_OK) 066 sos_irq_handler_array[irq_level] = NUL 063 sos_irq_handler_array[irq_level] = NULL; 067 } 064 } 068 else /* Disable this idt entry */ 065 else /* Disable this idt entry */ 069 { 066 { 070 retval 067 retval 071 = sos_idt_set_handler(SOS_IRQ_BASE + i 068 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 072 (sos_vaddr_t)NUL 069 (sos_vaddr_t)NULL /* Disable IDTE */, 073 0 /* Don't care 070 0 /* Don't care */); 074 } 071 } 075 072 076 /* Update the PIC only if an IRQ handler has 073 /* Update the PIC only if an IRQ handler has been set */ 077 if (sos_irq_handler_array[irq_level] != NULL 074 if (sos_irq_handler_array[irq_level] != NULL) 078 sos_i8259_enable_irq_line(irq_level); 075 sos_i8259_enable_irq_line(irq_level); 079 else 076 else 080 sos_i8259_disable_irq_line(irq_level); 077 sos_i8259_disable_irq_line(irq_level); 081 078 082 sos_restore_IRQs(flags); 079 sos_restore_IRQs(flags); 083 return retval; 080 return retval; 084 } 081 } 085 082 086 083 087 sos_irq_handler_t sos_irq_get_routine(int irq_ 084 sos_irq_handler_t sos_irq_get_routine(int irq_level) 088 { 085 { 089 if ((irq_level < 0) || (irq_level >= SOS_IRQ 086 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 090 return NULL; 087 return NULL; 091 088 092 /* Expected to be atomic */ 089 /* Expected to be atomic */ 093 return sos_irq_handler_array[irq_level]; 090 return sos_irq_handler_array[irq_level]; 094 } << 095 << 096 << 097 sos_ui32_t sos_irq_get_nested_level() << 098 { << 099 /* No need to disable interrupts here */ << 100 return sos_irq_nested_level_counter; << 101 } 091 }
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