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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 Copyright (C) 1999 Free Software Foundatio << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 #include "idt.h" 018 #include "idt.h" 020 #include "i8259.h" 019 #include "i8259.h" 021 020 022 #include "irq.h" 021 #include "irq.h" 023 022 024 /* array of IRQ wrappers, defined in irq_wrapp !! 023 /** array of IRQ wrappers, defined in irq_wrappers.S */ 025 extern sos_vaddr_t sos_irq_wrapper_array[SOS_I 024 extern sos_vaddr_t sos_irq_wrapper_array[SOS_IRQ_NUM]; 026 025 027 /* arrays of IRQ handlers, shared with irq_wra !! 026 /** arrays of IRQ handlers, shared with irq_wrappers.S */ 028 sos_irq_handler_t sos_irq_handler_array[SOS_IR 027 sos_irq_handler_t sos_irq_handler_array[SOS_IRQ_NUM] = { NULL, }; 029 028 >> 029 /** Number of interrupt handlers that are currently executing */ >> 030 sos_ui32_t sos_irq_nested_level_counter; 030 031 031 sos_ret_t sos_irq_setup(void) !! 032 sos_ret_t sos_irq_subsystem_setup(void) 032 { 033 { 033 return sos_i8259_setup(); !! 034 sos_irq_nested_level_counter = 0; >> 035 return sos_i8259_subsystem_setup(); 034 } 036 } 035 037 036 038 037 sos_ret_t sos_irq_set_routine(int irq_level, 039 sos_ret_t sos_irq_set_routine(int irq_level, 038 sos_irq_handler_ 040 sos_irq_handler_t routine) 039 { 041 { 040 sos_ret_t retval; 042 sos_ret_t retval; 041 sos_ui32_t flags; 043 sos_ui32_t flags; 042 044 043 if ((irq_level < 0) || (irq_level >= SOS_IRQ 045 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 044 return -SOS_EINVAL; 046 return -SOS_EINVAL; 045 047 046 sos_disable_IRQs(flags); 048 sos_disable_IRQs(flags); 047 049 048 retval = SOS_OK; 050 retval = SOS_OK; 049 051 050 /* Set the irq routine to be called by the I 052 /* Set the irq routine to be called by the IRQ wrapper */ 051 sos_irq_handler_array[irq_level] = routine; 053 sos_irq_handler_array[irq_level] = routine; 052 054 053 /* If the irq is to be enabled, update the I 055 /* If the irq is to be enabled, update the IDT with the IRQ 054 wrapper */ 056 wrapper */ 055 if (routine != NULL) 057 if (routine != NULL) 056 { 058 { 057 retval 059 retval 058 = sos_idt_set_handler(SOS_IRQ_BASE + i 060 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 059 (sos_vaddr_t) so 061 (sos_vaddr_t) sos_irq_wrapper_array[irq_level], 060 0 /* CPL0 routin 062 0 /* CPL0 routine */); 061 /* A problem occured */ 063 /* A problem occured */ 062 if (retval != SOS_OK) 064 if (retval != SOS_OK) 063 sos_irq_handler_array[irq_level] = NUL 065 sos_irq_handler_array[irq_level] = NULL; 064 } 066 } 065 else /* Disable this idt entry */ 067 else /* Disable this idt entry */ 066 { 068 { 067 retval 069 retval 068 = sos_idt_set_handler(SOS_IRQ_BASE + i 070 = sos_idt_set_handler(SOS_IRQ_BASE + irq_level, 069 (sos_vaddr_t)NUL 071 (sos_vaddr_t)NULL /* Disable IDTE */, 070 0 /* Don't care 072 0 /* Don't care */); 071 } 073 } 072 074 073 /* Update the PIC only if an IRQ handler has 075 /* Update the PIC only if an IRQ handler has been set */ 074 if (sos_irq_handler_array[irq_level] != NULL 076 if (sos_irq_handler_array[irq_level] != NULL) 075 sos_i8259_enable_irq_line(irq_level); 077 sos_i8259_enable_irq_line(irq_level); 076 else 078 else 077 sos_i8259_disable_irq_line(irq_level); 079 sos_i8259_disable_irq_line(irq_level); 078 080 079 sos_restore_IRQs(flags); 081 sos_restore_IRQs(flags); 080 return retval; 082 return retval; 081 } 083 } 082 084 083 085 084 sos_irq_handler_t sos_irq_get_routine(int irq_ 086 sos_irq_handler_t sos_irq_get_routine(int irq_level) 085 { 087 { 086 if ((irq_level < 0) || (irq_level >= SOS_IRQ 088 if ((irq_level < 0) || (irq_level >= SOS_IRQ_NUM)) 087 return NULL; 089 return NULL; 088 090 089 /* Expected to be atomic */ 091 /* Expected to be atomic */ 090 return sos_irq_handler_array[irq_level]; 092 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; 091 } 100 }
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