d3765835ed
These bits can be used to cache target-specific data in cputlb read from the page tables. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20190128223118.5255-5-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*
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* Memory transaction attributes
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*
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* Copyright (c) 2015 Linaro Limited.
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*
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* Authors:
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* Peter Maydell <peter.maydell@linaro.org>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef MEMATTRS_H
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#define MEMATTRS_H
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/* Every memory transaction has associated with it a set of
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* attributes. Some of these are generic (such as the ID of
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* the bus master); some are specific to a particular kind of
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* bus (such as the ARM Secure/NonSecure bit). We define them
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* all as non-overlapping bitfields in a single struct to avoid
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* confusion if different parts of QEMU used the same bit for
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* different semantics.
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*/
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typedef struct MemTxAttrs {
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/* Bus masters which don't specify any attributes will get this
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* (via the MEMTXATTRS_UNSPECIFIED constant), so that we can
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* distinguish "all attributes deliberately clear" from
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* "didn't specify" if necessary.
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*/
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unsigned int unspecified:1;
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/* ARM/AMBA: TrustZone Secure access
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* x86: System Management Mode access
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*/
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unsigned int secure:1;
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/* Memory access is usermode (unprivileged) */
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unsigned int user:1;
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/* Requester ID (for MSI for example) */
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unsigned int requester_id:16;
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/*
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* The following are target-specific page-table bits. These are not
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* related to actual memory transactions at all. However, this structure
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* is part of the tlb_fill interface, cached in the cputlb structure,
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* and has unused bits. These fields will be read by target-specific
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* helpers using env->iotlb[mmu_idx][tlb_index()].attrs.target_tlb_bitN.
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*/
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unsigned int target_tlb_bit0 : 1;
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unsigned int target_tlb_bit1 : 1;
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unsigned int target_tlb_bit2 : 1;
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} MemTxAttrs;
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/* Bus masters which don't specify any attributes will get this,
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* which has all attribute bits clear except the topmost one
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* (so that we can distinguish "all attributes deliberately clear"
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* from "didn't specify" if necessary).
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*/
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#define MEMTXATTRS_UNSPECIFIED ((MemTxAttrs) { .unspecified = 1 })
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/* New-style MMIO accessors can indicate that the transaction failed.
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* A zero (MEMTX_OK) response means success; anything else is a failure
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* of some kind. The memory subsystem will bitwise-OR together results
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* if it is synthesizing an operation from multiple smaller accesses.
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*/
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#define MEMTX_OK 0
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#define MEMTX_ERROR (1U << 0) /* device returned an error */
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#define MEMTX_DECODE_ERROR (1U << 1) /* nothing at that address */
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typedef uint32_t MemTxResult;
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#endif
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