Allow projects to define their own build.
To create a new project, add a directory under `project` and pass the
project name to `make`:
mkdir project/my_project
# Describe the build for the project.
PROJECT=my_project make
Projects can be maintained separately from the main repository.
Change-Id: I33a9d7ca801e2fb3dd9795ece44577b3b565e913
diff --git a/src/plat.c b/src/plat.c
new file mode 100644
index 0000000..c6c1018
--- /dev/null
+++ b/src/plat.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "hf/boot_params.h"
+#include "hf/dlog.h"
+#include "hf/fdt_handler.h"
+#include "hf/layout.h"
+
+/**
+ * Default implementation assumes the FDT has been linked into the image.
+ *
+ * This can be overridden e.g. to provide a fixed address or an address passed
+ * by the loader.
+ */
+#pragma weak plat_get_fdt_addr
+paddr_t plat_get_fdt_addr(void)
+{
+ return layout_fdt_begin();
+}
+
+/**
+ * Default implementation assumes the initrd has been linked into the image.
+ *
+ * This can be overridden e.g. to provide a fixed address or an address passed
+ * by the loader.
+ */
+#pragma weak plat_get_initrd_range
+void plat_get_initrd_range(paddr_t *begin, paddr_t *end)
+{
+ *begin = layout_initrd_begin();
+ *end = layout_initrd_end();
+}
+
+/**
+ * Default implementation assumes the FDT address is passed to the kernel.
+ *
+ * TODO: make this part of the VM configuration as secondary VMs will also need
+ * to take arguments.
+ */
+#pragma weak plat_get_kernel_arg
+uintreg_t plat_get_kernel_arg(void)
+{
+ return (uintreg_t)pa_addr(plat_get_fdt_addr());
+}
+
+/**
+ * Default implementation extracts the boot parameters from the FDT but the
+ * initrd is provided separately.
+ */
+#pragma weak plat_get_boot_params
+bool plat_get_boot_params(struct boot_params *p)
+{
+ struct fdt_header *fdt;
+ struct fdt_node n;
+ bool ret = false;
+
+ plat_get_initrd_range(&p->initrd_begin, &p->initrd_end);
+ p->kernel_arg = plat_get_kernel_arg();
+
+ /* Get the memory map from the FDT. */
+ fdt = fdt_map(plat_get_fdt_addr(), &n);
+ if (!fdt) {
+ return false;
+ }
+
+ if (!fdt_find_child(&n, "")) {
+ dlog("Unable to find FDT root node.\n");
+ goto out_unmap_fdt;
+ }
+
+ p->mem_ranges_count = 0;
+ fdt_find_memory_ranges(&n, p);
+
+ ret = true;
+
+out_unmap_fdt:
+ if (!fdt_unmap(fdt)) {
+ dlog("Unable to unmap fdt.");
+ return false;
+ }
+
+ return ret;
+}
+
+/**
+ * Default implementation updates the FDT which is the argument passed to the
+ * primary VM's kernel.
+ *
+ * TODO: in future, each VM will declare whether it expects an argument passed
+ * and that will be static data e.g. it will provide its own FDT so there will
+ * be no FDT modification. This is done because each VM has a very different
+ * view of the system and we don't want to force VMs to require loader code when
+ * another loader can load the data for it.
+ */
+#pragma weak plat_update_boot_params
+bool plat_update_boot_params(struct boot_params_update *p)
+{
+ return fdt_patch(plat_get_fdt_addr(), p);
+}