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https://github.com/drasko/codezero.git
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117e3482b6
Status: - Capability initialization is a bit hacky with dummy current etc. - All container caps belong to the pager - Tasks refer to their pager's capabilities for mutex allocation - Hacky. - Kernel container keeps quantitative caps and memory caps in separate lists - Hacky. These will all evolve and get fixed.
71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
/*
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* Capability checking for all system calls
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*
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* Copyright (C) 2009 Bahadir Balban
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*/
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#include <l4/generic/resource.h>
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#include <l4/generic/capability.h>
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#include <l4/generic/cap-types.h>
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#include <l4/api/errno.h>
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#include <l4/lib/printk.h>
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void capability_init(struct capability *cap)
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{
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cap->capid = id_new(&kernel_container.capability_ids);
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link_init(&cap->list);
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}
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/*
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* Boot-time function to create capability without
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* capability checking
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*/
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struct capability *boot_capability_create(void)
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{
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struct capability *cap = boot_alloc_capability();
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capability_init(cap);
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return cap;
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}
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struct capability *capability_create(void)
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{
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struct capability *cap = alloc_capability();
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capability_init(cap);
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return cap;
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}
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int capability_consume(struct capability *cap, int quantity)
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{
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if (cap->size < cap->used + quantity)
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return -ENOCAP;
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cap->used += quantity;
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return 0;
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}
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int capability_free(struct capability *cap, int quantity)
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{
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BUG_ON((cap->used -= quantity) < 0);
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return 0;
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}
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/*
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* Find a capability from a list by its resource type
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*/
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struct capability *capability_find_by_rtype(struct cap_list *clist,
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unsigned int rtype)
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{
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struct capability *cap;
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list_foreach_struct(cap, &clist->caps, list) {
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if ((cap->type & CAP_RTYPE_MASK) == rtype)
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return cap;
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}
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return 0;
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}
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