45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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#pragma once
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// From: https://github.com/s-matyukevich/raspberry-pi-os/blob/master/docs/lesson06/rpi-os.md
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/*
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* Memory region attributes:
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*
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* n = AttrIndx[2:0]
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* n MAIR
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* DEVICE_nGnRnE 000 00000000
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* NORMAL_NC 001 01000100
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*/
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#define MT_DEVICE_nGnRnE 0x0
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#define MT_NORMAL_NC 0x1
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#define MT_DEVICE_nGnRnE_FLAGS 0x00
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#define MT_NORMAL_NC_FLAGS 0x44
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#define MAIR_VALUE (MT_DEVICE_nGnRnE_FLAGS << (8 * MT_DEVICE_nGnRnE)) | (MT_NORMAL_NC_FLAGS << (8 * MT_NORMAL_NC))
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#define TCR_T0SZ (64 - 35)
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#define TCR_PS (0x01 << 16) // 36-bit physical address
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#define TCR_TG0_4K (0 << 14)
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#define TCR_SH0_OUTER_SHAREABLE (0x2 << 12)
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#define TCR_VALUE (TCR_T0SZ | TCR_PS | TCR_TG0_4K | TCR_SH0_OUTER_SHAREABLE)
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#define ENTRY_TYPE_TABLE_DESCRIPTOR 0x11
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#define ENTRY_TYPE_BLOCK_ENTRY 0x01
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#define ENTRY_TYPE_TABLE_ENTRY 0x11
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#define ENTRY_TYPE_INVALID 0x00
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#define MM_DESCRIPTOR_VALID (0x1)
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#define MM_DESCRIPTOR_BLOCK (0x0 << 1)
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#define MM_DESCRIPTOR_TABLE (0x1 << 1)
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// Block attributes
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#define MM_DESCRIPTOR_EXECUTE_NEVER (0x1ull << 54)
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#define MM_DESCRIPTOR_CONTIGUOUS (0x1ull << 52)
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#define MM_DESCRIPTOR_MAIR_INDEX(index) (index << 2)
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#define MM_TTBR_CNP (0x1)
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void setup_mmu_flat_map(void);
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