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cada0f8f18
- KIP's pointer to UTCB seems to work with existing l4lib ipc functions. - Works up to clone() - In clone we mmap() the same UTCB on each new thread - excessive. - Generally during page fault handling, cloned threads may fault on the same page multiple times even though a single handling would be enough for all of them. Need to detect and handle this.
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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* Kernel Interface Page and sys_kdata_read()
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*
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* Copyright (C) 2007, 2008 Bahadir Balban
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*/
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#include <l4/generic/tcb.h>
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#include <l4/generic/physmem.h>
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#include <l4/generic/space.h>
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#include <l4/api/errno.h>
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#include INC_API(kip.h)
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#include INC_API(syscall.h)
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#include INC_GLUE(memlayout.h)
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#include INC_ARCH(bootdesc.h)
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__attribute__ ((section(".data.kip"))) struct kip kip;
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/* Error-checked kernel data request call */
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int __sys_kread(int rd, void *dest)
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{
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int err = 0;
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unsigned long vaddr = (unsigned long)dest;
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switch(rd) {
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case KDATA_PAGE_MAP:
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// printk("Handling KDATA_PAGE_MAP request.\n");
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if (check_access(vaddr, sizeof(page_map), MAP_USR_RW_FLAGS) < 0)
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return -EINVAL;
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memcpy(dest, &page_map, sizeof(page_map));
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break;
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case KDATA_BOOTDESC:
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// printk("Handling KDATA_BOOTDESC request.\n");
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if (check_access(vaddr, bootdesc->desc_size, MAP_USR_RW_FLAGS) < 0)
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return -EINVAL;
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memcpy(dest, bootdesc, bootdesc->desc_size);
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break;
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case KDATA_BOOTDESC_SIZE:
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// printk("Handling KDATA_BOOTDESC_SIZE request.\n");
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if (check_access(vaddr, sizeof(unsigned int), MAP_USR_RW_FLAGS) < 0)
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return -EINVAL;
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*(unsigned int *)dest = bootdesc->desc_size;
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break;
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default:
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printk("Unsupported kernel data request.\n");
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err = -1;
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}
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return err;
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}
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/*
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* Privilaged tasks use this call to request data about the system during their
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* initialisation. This read-like call is only available during system startup.
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* It is much more flexible to use this method rather than advertise a customly
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* forged KIP to all tasks throughout the system lifetime. Note, this does not
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* support file positions, any such features aren't supported since this is call
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* is discarded after startup.
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*/
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int sys_kread(struct syscall_context *a)
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{
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unsigned int *arg = KTCB_REF_ARG0(current);
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void *addr = (void *)arg[1]; /* Buffer address */
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int rd = (int)arg[0]; /* Request descriptor */
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/* Error checking */
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if (rd < 0)
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return -EINVAL;
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return __sys_kread(rd, addr);
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}
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