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[Qemu-devel] [PULL 12/26] target-s390x: function to adjust the length wr
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PULL 12/26] target-s390x: function to adjust the length wrt page boundary |
Date: |
Wed, 17 Jun 2015 12:42:55 +0200 |
From: Aurelien Jarno <address@hidden>
This patch adds a function to adjust the length of a transfer so that
it doesn't cross a page boundary in softmmu mode. It does nothing in
user mode.
Signed-off-by: Aurelien Jarno <address@hidden>
Signed-off-by: Alexander Graf <address@hidden>
---
target-s390x/mem_helper.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/target-s390x/mem_helper.c b/target-s390x/mem_helper.c
index b4e5d44..b8d3a5f 100644
--- a/target-s390x/mem_helper.c
+++ b/target-s390x/mem_helper.c
@@ -54,6 +54,17 @@ void tlb_fill(CPUState *cs, target_ulong addr, int is_write,
int mmu_idx,
#define HELPER_LOG(x...)
#endif
+/* Reduce the length so that addr + len doesn't cross a page boundary. */
+static inline uint64_t adj_len_to_page(uint64_t len, uint64_t addr)
+{
+#ifndef CONFIG_USER_ONLY
+ if ((addr & ~TARGET_PAGE_MASK) + len - 1 >= TARGET_PAGE_SIZE) {
+ return -addr & ~TARGET_PAGE_MASK;
+ }
+#endif
+ return len;
+}
+
#ifndef CONFIG_USER_ONLY
static void mvc_fast_memset(CPUS390XState *env, uint32_t l, uint64_t dest,
uint8_t byte)
--
1.7.12.4
- [Qemu-devel] [PULL 00/26] s390 patch queue 2015-06-17, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 04/26] target-s390x: fix setcc in TCG mode, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 06/26] target-s390x: initialize I/O interrupt queue, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 15/26] target-s390x: add PER related constants, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 03/26] virtio-ccw: disable ioevent bit when ioeventfds are not enabled, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 09/26] target-s390x: wire up DIAG REIPL in TCG mode, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 05/26] target-s390x: correctly initialize ext interrupt queue, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 01/26] s390/ioinst: fix IO_INT_WORD_ISC macro, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 12/26] target-s390x: function to adjust the length wrt page boundary,
Alexander Graf <=
- [Qemu-devel] [PULL 16/26] target-s390x: add get_per_atmid function, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 11/26] softmmu: provide tlb_vaddr_to_host function for user mode, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 26/26] s390x: Switch to s390-ccw machine as default, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 23/26] target-s390x: PER store-using-real-address event support, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 07/26] target-s390x: fix s390_cpu_initial_reset, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 20/26] target-s390x: PER instruction-fetch event support, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 13/26] target-s390x: mvc_fast_memset: access memory through softmmu, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 08/26] target-s390x: wire up DIAG IPL in TCG mode, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 02/26] s390/ioinst: fix endianness in ioinst_schib_valid, Alexander Graf, 2015/06/17
- [Qemu-devel] [PULL 18/26] target-s390x: basic PER event handling, Alexander Graf, 2015/06/17