Merge remote-tracking branch 'remotes/alistair/tags/pull-riscv-to-apply-20200713' into staging

This is a colection of bug fixes and small imrprovements for RISC-V.

This includes some vector extensions fixes, a PMP bug fix, OpenTitan
UART bug fix and support for OpenSBI dynamic firmware.

# gpg: Signature made Tue 14 Jul 2020 01:29:44 BST
# gpg:                using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full]
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8  CE8F 21E1 0D29 DF97 7054

* remotes/alistair/tags/pull-riscv-to-apply-20200713:
  target/riscv: Fix pmp NA4 implementation
  tcg/riscv: Remove superfluous breaks
  hw/char: Convert the Ibex UART to use the registerfields API
  hw/char: Convert the Ibex UART to use the qdev Clock model
  target/riscv: fix vill bit index in vtype register
  target/riscv: fix return value of do_opivx_widen()
  target/riscv: correct the gvec IR called in gen_vec_rsub16_i64()
  target/riscv: fix rsub gvec tcg_assert_listed_vecop assertion
  hw/riscv: Modify MROM size to end at 0x10000
  RISC-V: Support 64 bit start address
  riscv: Add opensbi firmware dynamic support
  RISC-V: Copy the fdt in dram instead of ROM
  riscv: Unify Qemu's reset vector code path
  hw/riscv: virt: Sort the SoC memmap table entries
  MAINTAINERS: Add an entry for OpenSBI firmware

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 20 insertions, 43 deletions

diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index f7630c8a89..55a907bb35 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -39,12 +39,9 @@
 #include "sysemu/arch_init.h"
 #include "sysemu/device_tree.h"
 #include "sysemu/sysemu.h"
-#include "exec/address-spaces.h"
 #include "hw/pci/pci.h"
 #include "hw/pci-host/gpex.h"
 
-#include <libfdt.h>
-
 #if defined(TARGET_RISCV32)
 # define BIOS_FILENAME "opensbi-riscv32-virt-fw_jump.bin"
 #else
@@ -56,18 +53,18 @@ static const struct MemmapEntry {
     hwaddr size;
 } virt_memmap[] = {
     [VIRT_DEBUG] =       {        0x0,         0x100 },
-    [VIRT_MROM] =        {     0x1000,       0x11000 },
+    [VIRT_MROM] =        {     0x1000,        0xf000 },
     [VIRT_TEST] =        {   0x100000,        0x1000 },
     [VIRT_RTC] =         {   0x101000,        0x1000 },
     [VIRT_CLINT] =       {  0x2000000,       0x10000 },
+    [VIRT_PCIE_PIO] =    {  0x3000000,       0x10000 },
     [VIRT_PLIC] =        {  0xc000000,     0x4000000 },
     [VIRT_UART0] =       { 0x10000000,         0x100 },
     [VIRT_VIRTIO] =      { 0x10001000,        0x1000 },
     [VIRT_FLASH] =       { 0x20000000,     0x4000000 },
-    [VIRT_DRAM] =        { 0x80000000,           0x0 },
-    [VIRT_PCIE_MMIO] =   { 0x40000000,    0x40000000 },
-    [VIRT_PCIE_PIO] =    { 0x03000000,    0x00010000 },
     [VIRT_PCIE_ECAM] =   { 0x30000000,    0x10000000 },
+    [VIRT_PCIE_MMIO] =   { 0x40000000,    0x40000000 },
+    [VIRT_DRAM] =        { 0x80000000,           0x0 },
 };
 
 #define VIRT_FLASH_SECTOR_SIZE (256 * KiB)
@@ -481,6 +478,8 @@ static void virt_machine_init(MachineState *machine)
     char *plic_hart_config;
     size_t plic_hart_config_len;
     target_ulong start_addr = memmap[VIRT_DRAM].base;
+    uint32_t fdt_load_addr;
+    uint64_t kernel_entry;
     int i;
     unsigned int smp_cpus = machine->smp.cpus;
 
@@ -512,8 +511,7 @@ static void virt_machine_init(MachineState *machine)
                                  memmap[VIRT_DRAM].base, NULL);
 
     if (machine->kernel_filename) {
-        uint64_t kernel_entry = riscv_load_kernel(machine->kernel_filename,
-                                                  NULL);
+        kernel_entry = riscv_load_kernel(machine->kernel_filename, NULL);
 
         if (machine->initrd_filename) {
             hwaddr start;
@@ -525,6 +523,12 @@ static void virt_machine_init(MachineState *machine)
             qemu_fdt_setprop_cell(s->fdt, "/chosen", "linux,initrd-end",
                                   end);
         }
+    } else {
+       /*
+        * If dynamic firmware is used, it doesn't know where is the next mode
+        * if kernel argument is not set.
+        */
+        kernel_entry = 0;
     }
 
     if (drive_get(IF_PFLASH, 0, 0)) {
@@ -535,40 +539,13 @@ static void virt_machine_init(MachineState *machine)
         start_addr = virt_memmap[VIRT_FLASH].base;
     }
 
-    /* reset vector */
-    uint32_t reset_vec[8] = {
-        0x00000297,                  /* 1:  auipc  t0, %pcrel_hi(dtb) */
-        0x02028593,                  /*     addi   a1, t0, %pcrel_lo(1b) */
-        0xf1402573,                  /*     csrr   a0, mhartid  */
-#if defined(TARGET_RISCV32)
-        0x0182a283,                  /*     lw     t0, 24(t0) */
-#elif defined(TARGET_RISCV64)
-        0x0182b283,                  /*     ld     t0, 24(t0) */
-#endif
-        0x00028067,                  /*     jr     t0 */
-        0x00000000,
-        start_addr,                  /* start: .dword */
-        0x00000000,
-                                     /* dtb: */
-    };
-
-    /* copy in the reset vector in little_endian byte order */
-    for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
-        reset_vec[i] = cpu_to_le32(reset_vec[i]);
-    }
-    rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
-                          memmap[VIRT_MROM].base, &address_space_memory);
-
-    /* copy in the device tree */
-    if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
-            memmap[VIRT_MROM].size - sizeof(reset_vec)) {
-        error_report("not enough space to store device-tree");
-        exit(1);
-    }
-    qemu_fdt_dumpdtb(s->fdt, fdt_totalsize(s->fdt));
-    rom_add_blob_fixed_as("mrom.fdt", s->fdt, fdt_totalsize(s->fdt),
-                          memmap[VIRT_MROM].base + sizeof(reset_vec),
-                          &address_space_memory);
+    /* Compute the fdt load address in dram */
+    fdt_load_addr = riscv_load_fdt(memmap[VIRT_DRAM].base,
+                                   machine->ram_size, s->fdt);
+    /* load the reset vector */
+    riscv_setup_rom_reset_vec(start_addr, virt_memmap[VIRT_MROM].base,
+                              virt_memmap[VIRT_MROM].size, kernel_entry,
+                              fdt_load_addr, s->fdt);
 
     /* create PLIC hart topology configuration string */
     plic_hart_config_len = (strlen(VIRT_PLIC_HART_CONFIG) + 1) * smp_cpus;