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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
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82
src/glue/arm/systable.c Normal file
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/*
* System Calls
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <l4/lib/mutex.h>
#include <l4/lib/printk.h>
#include <l4/generic/space.h>
#include <l4/api/errno.h>
#include INC_GLUE(memlayout.h)
#include INC_GLUE(syscall.h)
#include INC_SUBARCH(mm.h)
#include INC_API(syscall.h)
#include INC_API(kip.h)
void kip_init_syscalls(void)
{
kip.space_control = ARM_SYSCALL_PAGE + sys_space_control_offset;
kip.thread_control = ARM_SYSCALL_PAGE + sys_thread_control_offset;
kip.ipc_control = ARM_SYSCALL_PAGE + sys_ipc_control_offset;
kip.map = ARM_SYSCALL_PAGE + sys_map_offset;
kip.ipc = ARM_SYSCALL_PAGE + sys_ipc_offset;
kip.kread = ARM_SYSCALL_PAGE + sys_kread_offset;
kip.unmap = ARM_SYSCALL_PAGE + sys_unmap_offset;
kip.exchange_registers = ARM_SYSCALL_PAGE + sys_exchange_registers_offset;
kip.thread_switch = ARM_SYSCALL_PAGE + sys_thread_switch_offset;
kip.schedule = ARM_SYSCALL_PAGE + sys_schedule_offset;
kip.getid = ARM_SYSCALL_PAGE + sys_getid_offset;
kip.kmem_grant = ARM_SYSCALL_PAGE + sys_kmem_grant_offset;
kip.kmem_reclaim = ARM_SYSCALL_PAGE + sys_kmem_reclaim_offset;
}
/* Jump table for all system calls. */
syscall_fn_t syscall_table[SYSCALLS_TOTAL];
/*
* Initialises the system call jump table, for kernel to use.
* Also maps the system call page into userspace.
*/
void syscall_init()
{
syscall_table[sys_ipc_offset >> 2] = (syscall_fn_t)sys_ipc;
syscall_table[sys_thread_switch_offset >> 2] = (syscall_fn_t)sys_thread_switch;
syscall_table[sys_thread_control_offset >> 2] = (syscall_fn_t)sys_thread_control;
syscall_table[sys_exchange_registers_offset >> 2] = (syscall_fn_t)sys_exchange_registers;
syscall_table[sys_schedule_offset >> 2] = (syscall_fn_t)sys_schedule;
syscall_table[sys_getid_offset >> 2] = (syscall_fn_t)sys_getid;
syscall_table[sys_unmap_offset >> 2] = (syscall_fn_t)sys_unmap;
syscall_table[sys_space_control_offset >> 2] = (syscall_fn_t)sys_space_control;
syscall_table[sys_ipc_control_offset >> 2] = (syscall_fn_t)sys_ipc_control;
syscall_table[sys_map_offset >> 2] = (syscall_fn_t)sys_map;
syscall_table[sys_kread_offset >> 2] = (syscall_fn_t)sys_kread;
syscall_table[sys_kmem_grant_offset >> 2] = (syscall_fn_t)sys_kmem_grant;
syscall_table[sys_kmem_reclaim_offset >> 2] = (syscall_fn_t)sys_kmem_reclaim;
add_mapping(virt_to_phys(&__syscall_page_start),
ARM_SYSCALL_PAGE, PAGE_SIZE, MAP_USR_RO_FLAGS);
}
/* Checks a syscall is legitimate and dispatches to appropriate handler. */
int syscall(struct syscall_args *regs, unsigned long swi_addr)
{
/* Check if genuine system call, coming from the syscall page */
if ((swi_addr & ARM_SYSCALL_PAGE) == ARM_SYSCALL_PAGE) {
/* Check within syscall offset boundary */
if (((swi_addr & syscall_offset_mask) >= 0) &&
((swi_addr & syscall_offset_mask) <= syscalls_end_offset)) {
/* Quick jump, rather than compare each */
return (*syscall_table[(swi_addr & 0xFF) >> 2])(regs);
} else {
printk("System call received from call @ 0x%lx."
"Instruction: 0x%lx.\n", swi_addr,
*((unsigned long *)swi_addr));
return -ENOSYS;
}
} else {
printk("System call exception from unknown location 0x%lx."
"Discarding.\n", swi_addr);
return -ENOSYS;
}
}