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[kernel] Change VMA syscall addr param to inout

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This change allows the `vma_map` and `vma_create_map` syscalls to map to
addresses other than the one specified, and therefore makes the address
parameter to those syscalls `inout` in order to return the mapped
address.

Also add the `exact` flag for specifying that mapping needs to be done
at the exact address given. If the mapping collides with another, the
new `j6_err_collision` error is returned.
This commit is contained in:
Justin C. Miller
2023-08-31 19:40:02 -07:00
parent 8cbde13139
commit fc16ed54b3
16 changed files with 93 additions and 69 deletions
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4
src/libraries/j6/channel.cpp
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@@ -56,7 +56,7 @@ channel::create(size_t size)
channel_addr += size * 2; // account for ring buffer virtual space doubling
lock.release();
result = j6_vma_create_map(&vma, size, addr, j6_vm_flag_write|j6_vm_flag_ring);
result = j6_vma_create_map(&vma, size, &addr, j6_vm_flag_write|j6_vm_flag_ring);
if (result != j6_status_ok) {
syslog("Failed to create channel VMA. Error: %lx", result);
return nullptr;
@@ -77,7 +77,7 @@ channel::open(j6_handle_t vma)
util::scoped_lock lock {addr_spinlock};
uintptr_t addr = channel_addr;
result = j6_vma_map(vma, 0, addr);
result = j6_vma_map(vma, 0, &addr, 0);
if (result != j6_status_ok) {
syslog("Failed to map channel VMA. Error: %lx", result);
return nullptr;