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