diff options
Diffstat (limited to 'include/exec')
| -rw-r--r-- | include/exec/memory.h | 74 | ||||
| -rw-r--r-- | include/exec/ram_addr.h | 1 |
2 files changed, 57 insertions, 18 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index a0993e50ab..01f10049c1 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1234,23 +1234,7 @@ MemTxResult address_space_write(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, const uint8_t *buf, int len); -/** - * address_space_read: read from an address space. - * - * Return a MemTxResult indicating whether the operation succeeded - * or failed (eg unassigned memory, device rejected the transaction, - * IOMMU fault). - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @attrs: memory transaction attributes - * @buf: buffer with the data transferred - */ -MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, - uint8_t *buf, int len); - -/** - * address_space_ld*: load from an address space +/* address_space_ld*: load from an address space * address_space_st*: store to an address space * * These functions perform a load or store of the byte, word, @@ -1385,6 +1369,62 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, uint8_t *buf, int len, hwaddr addr1, hwaddr l, MemoryRegion *mr); +MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr, + MemTxAttrs attrs, uint8_t *buf, int len); +void *qemu_get_ram_ptr(ram_addr_t addr); + +static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) +{ + if (is_write) { + return memory_region_is_ram(mr) && !mr->readonly; + } else { + return memory_region_is_ram(mr) || memory_region_is_romd(mr); + } + + return false; +} + +/** + * address_space_read: read from an address space. + * + * Return a MemTxResult indicating whether the operation succeeded + * or failed (eg unassigned memory, device rejected the transaction, + * IOMMU fault). + * + * @as: #AddressSpace to be accessed + * @addr: address within that address space + * @attrs: memory transaction attributes + * @buf: buffer with the data transferred + */ +static inline __attribute__((__always_inline__)) +MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, + uint8_t *buf, int len) +{ + MemTxResult result = MEMTX_OK; + hwaddr l, addr1; + void *ptr; + MemoryRegion *mr; + + if (__builtin_constant_p(len)) { + if (len) { + rcu_read_lock(); + l = len; + mr = address_space_translate(as, addr, &addr1, &l, false); + if (len == l && memory_access_is_direct(mr, false)) { + addr1 += memory_region_get_ram_addr(mr); + ptr = qemu_get_ram_ptr(addr1); + memcpy(buf, ptr, len); + } else { + result = address_space_read_continue(as, addr, attrs, buf, len, + addr1, l, mr); + } + rcu_read_unlock(); + } + } else { + result = address_space_read_full(as, addr, attrs, buf, len); + } + return result; +} #endif diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index d1d9963680..ba4c04d202 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -73,7 +73,6 @@ ram_addr_t qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size, MemoryRegion *mr, Error **errp); int qemu_get_ram_fd(ram_addr_t addr); void *qemu_get_ram_block_host_ptr(ram_addr_t addr); -void *qemu_get_ram_ptr(ram_addr_t addr); void qemu_ram_free(ram_addr_t addr); int qemu_ram_resize(ram_addr_t base, ram_addr_t newsize, Error **errp); |