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[kernel] Make capabilities/handles global

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Instead of handles / capabilities having numeric ids that are only valid
for the owning process, they are now global in a system capabilities
table. This will allow for specifying capabilities in IPC that doesn't
need to be kernel-controlled.

Processes will still need to be granted access to given capabilities,
but that can become a simpler system call than the current method of
sending them through mailbox messages (and worse, having to translate
every one into a new capability like was the case before). In order to
track which handles a process has access to, a new node_set based on
node_map allows for an efficient storage and lookup of handles.
This commit is contained in:
Justin C. Miller
2022-10-10 21:19:25 -07:00
parent 41bb97b179
commit 9ac4e51224
27 changed files with 337 additions and 383 deletions
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14
src/kernel/memory_bootstrap.cpp
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@@ -5,6 +5,7 @@
#include <util/no_construct.h>
#include "assert.h"
#include "capabilities.h"
#include "device_manager.h"
#include "frame_allocator.h"
#include "heap_allocator.h"
@@ -31,6 +32,9 @@ uintptr_t g_slabs_bump_pointer;
static util::no_construct<heap_allocator> __g_kernel_heap_storage;
heap_allocator &g_kernel_heap = __g_kernel_heap_storage.value;
static util::no_construct<cap_table> __g_cap_table_storage;
cap_table &g_cap_table = __g_cap_table_storage.value;
static util::no_construct<frame_allocator> __g_frame_allocator_storage;
frame_allocator &g_frame_allocator = __g_frame_allocator_storage.value;
@@ -40,6 +44,9 @@ obj::vm_area_untracked &g_kernel_heap_area = __g_kernel_heap_area_storage.value;
static util::no_construct<obj::vm_area_untracked> __g_kernel_heapmap_area_storage;
obj::vm_area_untracked &g_kernel_heapmap_area = __g_kernel_heapmap_area_storage.value;
static util::no_construct<obj::vm_area_untracked> __g_cap_table_area_storage;
obj::vm_area_untracked &g_cap_table_area = __g_cap_table_area_storage.value;
static util::no_construct<obj::vm_area_guarded> __g_kernel_stacks_storage;
obj::vm_area_guarded &g_kernel_stacks = __g_kernel_stacks_storage.value;
@@ -104,6 +111,13 @@ memory_initialize_pre_ctors(bootproto::args &kargs)
new (&g_kernel_heap) heap_allocator {mem::heap_offset, mem::heap_size, mem::heapmap_offset};
obj::vm_area *caps = new (&g_cap_table_area)
obj::vm_area_untracked(mem::caps_size, vm_flags::write);
vm.add(mem::caps_offset, caps);
new (&g_cap_table) cap_table {mem::caps_offset};
obj::vm_area *stacks = new (&g_kernel_stacks) obj::vm_area_guarded {
mem::stacks_offset,
mem::kernel_stack_pages,