# Copyright 2020 The Fuchsia Authors
#
# Use of this source code is governed by a MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT

import("//build/cpp/library_headers.gni")
import("//build/zircon/zircon_cpu.gni")
import("//zircon/system/ulib/hwreg/hwreg_asm_header.gni")

group("headers") {
  # The per-CPU subdirectory is a separate library target but it shares
  # (and overrides) the <lib/arch/...> header name space and users of this
  # library need never realize it's distinct.

  if (is_host) {
    public_deps = [ "host" ]
  } else {
    public_deps = [
      "$zircon_cpu:headers",

      # These would be circular dependencies on the host, since that's where
      # the generator programs are built and they need the library's headers.
      # Since these headers are meant to be used by assembly code, they should
      # not be needed by any host-compatible code.
      ":gen-arm64-sysreg-asm",
      ":gen-riscv64-system-asm",
      ":gen-x86-msr-asm",
    ]
  }

  # This comes after the arch-specific one so arch-specific headers
  # take precedence (and can use `#include_next`).
  public_deps += [ ":common-headers" ]
}

library_headers("common-headers") {
  visibility = [ ":*" ]

  headers = []
  public_deps = [
    "//sdk/lib/stdcompat",

    # <lib/arch/zbi.h> has #include <lib/zbi-format/kernel.h>
    # <lib/arch/zbi.h> has #include <lib/zbi-format/zbi.h>
    "//sdk/lib/zbi-format",

    # <lib/arch/zbi.h> has #include <fidl/zbi/data/asm/zbi.h>
    "//sdk/fidl/zbi:zbi_zither.asm",

    # <lib/arch/x86/cpuid.h> has #include <hwreg/bitfields.h>.
    "//zircon/system/ulib/hwreg:headers",
  ]

  if (is_kernel) {
    # <lib/arch/arm64/page-table.h> has #include <fbl/bits.h>
    # <lib/arch/riscv64/page-table.h> has #include <fbl/bits.h>
    # <lib/arch/x86/page-table.h> has #include <fbl/bits.h>
    public_deps += [ "//zircon/system/ulib/fbl:headers" ]
  } else {
    public_deps += [ "//zircon/system/ulib/fbl" ]
  }
}

static_library("arch") {
  public_deps = [ ":headers" ]

  sources = [
    "cpuid.cc",
    "riscv64-features.cc",
  ]

  if (is_fuchsia || is_kernel) {
    deps = [ zircon_cpu ]
  }
}

group("tests") {
  testonly = true
  deps = [ "test:tests" ]
}

hwreg_asm_header("gen-x86-msr-asm") {
  visibility = [ ":*" ]
  output_name = "lib/arch/x86/msr-asm.h"
  defines = [ "LIB_ARCH_PRINTERS" ]
  sources = [ "gen-x86-msr-asm.cc" ]
  deps = [ ":arch" ]
}

hwreg_asm_header("gen-arm64-sysreg-asm") {
  visibility = [ ":*" ]
  output_name = "lib/arch/arm64/sysreg-asm.h"
  defines = [ "LIB_ARCH_PRINTERS" ]
  sources = [ "gen-arm64-sysreg-asm.cc" ]
  deps = [ ":arch" ]
}

hwreg_asm_header("gen-riscv64-system-asm") {
  visibility = [ ":*" ]
  output_name = "lib/arch/riscv64/system-asm.h"
  defines = [ "LIB_ARCH_PRINTERS" ]
  sources = [ "gen-riscv64-system-asm.cc" ]
  deps = [ ":arch" ]
}