23 lines
679 B
C
23 lines
679 B
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <device/pci_ops.h>
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#include <cpu/x86/smm.h>
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#include <soc/pci_devs.h>
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void smm_region(uintptr_t *start, size_t *size)
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{
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uintptr_t tseg_base = pci_read_config32(VTD_DEV(0), VTD_TSEG_BASE_CSR);
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uintptr_t tseg_limit = pci_read_config32(VTD_DEV(0), VTD_TSEG_LIMIT_CSR);
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tseg_base = ALIGN_DOWN(tseg_base, 1 * MiB);
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tseg_limit = ALIGN_DOWN(tseg_limit, 1 * MiB);
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/* Only the upper [31:20] bits of an address are checked against
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* VTD_TSEG_LIMIT_CSR[31:20] which must be below or equal, so this
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* effectively means +1MiB for the limit.
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*/
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tseg_limit += 1 * MiB;
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*start = tseg_base;
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*size = tseg_limit - tseg_base;
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}
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