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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
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78
src/api/kip.c Normal file
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/*
* Kernel Interface Page and sys_kdata_read()
*
* Copyright (C) 2007 Bahadir Balban
*
*/
#include <l4/generic/tcb.h>
#include <l4/generic/physmem.h>
#include INC_API(kip.h)
#include INC_API(syscall.h)
#include INC_GLUE(memlayout.h)
#include INC_ARCH(bootdesc.h)
/* FIXME: Change the unit name */
UNIT("kip") struct kip kip;
/* Error-checked kernel data request call */
int __sys_kread(int rd, void *dest)
{
int err = 0;
switch(rd) {
case KDATA_PAGE_MAP:
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
printk("Handling KDATA_PAGE_MAP request.\n");
memcpy(dest, &page_map, sizeof(page_map));
break;
case KDATA_BOOTDESC:
printk("Handling KDATA_BOOTDESC request.\n");
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
memcpy(dest, bootdesc, bootdesc->desc_size);
break;
case KDATA_BOOTDESC_SIZE:
printk("Handling KDATA_BOOTDESC_SIZE request.\n");
/*
* FIXME:FIXME: Check if address is mapped here first!!!
* Also check if process has enough buffer for physmem to fit!!!
*/
*(unsigned int *)dest = bootdesc->desc_size;
break;
default:
printk("Unsupported kernel data request.\n");
err = -1;
}
return err;
}
/*
* Privilaged tasks use this call to request data about the system during their
* initialisation. This read-like call is only available during system startup.
* It is much more flexible to use this method rather than advertise a customly
* forged KIP to all tasks throughout the system lifetime. Note, this does not
* support file positions, any such features aren't supported since this is call
* is discarded after startup.
*/
int sys_kread(struct syscall_args *a)
{
unsigned int *arg = KTCB_REF_ARG0(current);
void *addr = (void *)arg[1]; /* Buffer address */
int rd = (int)arg[0]; /* Request descriptor */
/* Error checking */
if ((rd < 0) || (addr <= 0)) {
printk("%s: Invalid arguments.\n", __FUNCTION__);
return -1;
}
return __sys_kread(rd, addr);
}