43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
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#include "vxBoot/builtin.h"
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#include "vxBoot/terminal.h"
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#include <gint/mmu.h>
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static ptrdiff_t __ram_get_size(uintptr_t start_ram)
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{
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volatile uint32_t *ptr = (void*)start_ram;
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volatile uint32_t *tst = (void*)start_ram;
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uint32_t backup;
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//TODO: use UTLB page size information
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while (1) {
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ptr = &ptr[4096];
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backup = ptr[0];
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ptr[0] = 0xdeadbeef;
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if (ptr[0] == tst[0]) break;
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ptr[0] = backup;
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}
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ptr[0] = backup;
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return ((ptrdiff_t)((uintptr_t)ptr - (uintptr_t)tst));
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}
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/* hw_main() : hw builtin entry */
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int hw_main(int argc, char **argv)
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{
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//TODO handle args
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(void)argc;
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(void)argv;
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uintptr_t uram = mmu_translate(0x08100000, NULL);
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uintptr_t bram = uram & 0xff000000;
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terminal_write("user RAM physical addr: %p\n", uram);
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terminal_write("RAM physical addr: %p\n", bram);
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terminal_write("RAM size: ");
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uintptr_t size = __ram_get_size((uram & 0xff000000) | 0xa0000000);
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terminal_write("%d bytes\n", size);
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terminal_write("kernel RAM space: %d o\n", size - (uram & 0x00ffffff));
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return (0);
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}
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