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sel4: use largest untyped range

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Norman Feske 2015-02-11 14:47:55 +01:00 committed by Christian Helmuth
parent 37c266327f
commit 58481fe35d
1 changed files with 30 additions and 2 deletions
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32
repos/base-sel4/src/test/sel4/main.cc
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@ -121,6 +121,34 @@ void second_thread_entry()
} }
/**
* Return cap selector of largest available untyped memory range
*/
static seL4_Untyped const largest_untyped_range(seL4_BootInfo const &bi)
{
using Genode::size_t;
seL4_Untyped largest = 0;
size_t largest_size = 0;
unsigned const idx_start = bi.untyped.start;
unsigned const idx_size = bi.untyped.end - idx_start;
for (unsigned i = idx_start; i < idx_start + idx_size; i++) {
size_t const size = (1UL << bi.untypedSizeBitsList[i - idx_start]) - 1;
if (size <= largest_size)
continue;
largest_size = size;
largest = i;
}
return largest;
}
extern char _bss_start, _bss_end; extern char _bss_start, _bss_end;
int main() int main()
@ -136,8 +164,8 @@ int main()
PDBG("seL4_SetUserData"); PDBG("seL4_SetUserData");
seL4_SetUserData((seL4_Word)bi->ipcBuffer); seL4_SetUserData((seL4_Word)bi->ipcBuffer);
/* yse first untyped memory region for allocating kernel objects */ /* yse largest untyped memory region for allocating kernel objects */
seL4_Untyped const untyped = bi->untyped.start; seL4_Untyped const untyped = largest_untyped_range(*bi);
/* offset to next free position within the untyped memory range */ /* offset to next free position within the untyped memory range */
unsigned long untyped_offset = 0; unsigned long untyped_offset = 0;