[PATCH] hw/riscv/spike: Replace tswap64() by ldq_endian_p()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Hold the target endianness in HTIFState::target_is_bigendian.
Pass the target endianness as argument to htif_mm_init().
Replace tswap64() calls by ldq_endian_p() ones.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
Based-on: <20240930073450.33195-2-philmd@linaro.org>
          "qemu/bswap: Introduce ld/st_endian_p() API"

Note: this is a non-QOM device!
---
 include/hw/char/riscv_htif.h |  4 +++-
 hw/char/riscv_htif.c         | 17 +++++++++++------
 hw/riscv/spike.c             |  2 +-
 3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/include/hw/char/riscv_htif.h b/include/hw/char/riscv_htif.h
index df493fdf6b..24868ddfe1 100644
--- a/include/hw/char/riscv_htif.h
+++ b/include/hw/char/riscv_htif.h
@@ -35,6 +35,7 @@ typedef struct HTIFState {
     hwaddr tohost_offset;
     hwaddr fromhost_offset;
     MemoryRegion mmio;
+    bool target_is_bigendian;
 
     CharBackend chr;
     uint64_t pending_read;
@@ -49,6 +50,7 @@ void htif_symbol_callback(const char *st_name, int st_info, uint64_t st_value,
 
 /* legacy pre qom */
 HTIFState *htif_mm_init(MemoryRegion *address_space, Chardev *chr,
-                        uint64_t nonelf_base, bool custom_base);
+                        uint64_t nonelf_base, bool custom_base,
+                        bool target_is_bigendian);
 
 #endif
diff --git a/hw/char/riscv_htif.c b/hw/char/riscv_htif.c
index 9bef60def1..77951f3c76 100644
--- a/hw/char/riscv_htif.c
+++ b/hw/char/riscv_htif.c
@@ -30,7 +30,6 @@
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
 #include "exec/address-spaces.h"
-#include "exec/tswap.h"
 #include "sysemu/dma.h"
 #include "sysemu/runstate.h"
 
@@ -211,13 +210,17 @@ static void htif_handle_tohost_write(HTIFState *s, uint64_t val_written)
                     SHUTDOWN_CAUSE_GUEST_SHUTDOWN, exit_code);
                 return;
             } else {
+                bool be = s->target_is_bigendian;
                 uint64_t syscall[8];
+
                 cpu_physical_memory_read(payload, syscall, sizeof(syscall));
-                if (tswap64(syscall[0]) == PK_SYS_WRITE &&
-                    tswap64(syscall[1]) == HTIF_DEV_CONSOLE &&
-                    tswap64(syscall[3]) == HTIF_CONSOLE_CMD_PUTC) {
+                if (ldq_endian_p(be, &syscall[0]) == PK_SYS_WRITE &&
+                    ldq_endian_p(be, &syscall[1]) == HTIF_DEV_CONSOLE &&
+                    ldq_endian_p(be, &syscall[3]) == HTIF_CONSOLE_CMD_PUTC) {
                     uint8_t ch;
-                    cpu_physical_memory_read(tswap64(syscall[2]), &ch, 1);
+
+                    cpu_physical_memory_read(ldl_endian_p(be, &syscall[2]),
+                                             &ch, 1);
                     qemu_chr_fe_write(&s->chr, &ch, 1);
                     resp = 0x100 | (uint8_t)payload;
                 } else {
@@ -320,7 +323,8 @@ static const MemoryRegionOps htif_mm_ops = {
 };
 
 HTIFState *htif_mm_init(MemoryRegion *address_space, Chardev *chr,
-                        uint64_t nonelf_base, bool custom_base)
+                        uint64_t nonelf_base, bool custom_base,
+                        bool target_is_bigendian)
 {
     uint64_t base, size, tohost_offset, fromhost_offset;
 
@@ -345,6 +349,7 @@ HTIFState *htif_mm_init(MemoryRegion *address_space, Chardev *chr,
     s->pending_read = 0;
     s->allow_tohost = 0;
     s->fromhost_inprogress = 0;
+    s->target_is_bigendian = target_is_bigendian;
     qemu_chr_fe_init(&s->chr, chr, &error_abort);
     qemu_chr_fe_set_handlers(&s->chr, htif_can_recv, htif_recv, htif_event,
         htif_be_change, s, NULL, true);
diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index 64074395bc..0989cd4a41 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -327,7 +327,7 @@ static void spike_board_init(MachineState *machine)
 
     /* initialize HTIF using symbols found in load_kernel */
     htif_mm_init(system_memory, serial_hd(0), memmap[SPIKE_HTIF].base,
-                 htif_custom_base);
+                 htif_custom_base, TARGET_BIG_ENDIAN);
 }
 
 static void spike_set_signature(Object *obj, const char *val, Error **errp)
-- 
2.45.2