kboot: Replace kboot_set_bootargs with kboot_set_chosen

This allows setting arbitrary /chosen string props

Signed-off-by: Hector Martin <marcan@marcan.st>

proxyclient/m1n1/proxy.py

@@ -538,7 +538,7 @@ class M1N1Proxy(Reloadable):
     P_FREE = 0x602
 
     P_KBOOT_BOOT = 0x700
-    P_KBOOT_SET_BOOTARGS = 0x701
+    P_KBOOT_SET_CHOSEN = 0x701
     P_KBOOT_SET_INITRD = 0x702
     P_KBOOT_PREPARE_DT = 0x703
 
@@ -920,8 +920,8 @@ class M1N1Proxy(Reloadable):
 
     def kboot_boot(self, kernel):
         self.request(self.P_KBOOT_BOOT, kernel)
-    def kboot_set_bootargs(self, bootargs):
-        self.request(self.P_KBOOT_SET_BOOTARGS, bootargs)
+    def kboot_set_chosen(self, name, value):
+        self.request(self.P_KBOOT_SET_CHOSEN, name, value)
     def kboot_set_initrd(self, base, size):
         self.request(self.P_KBOOT_SET_INITRD, base, size)
     def kboot_prepare_dt(self, dt_addr):

proxyclient/tools/linux.py

@@ -45,7 +45,7 @@ else:
 
 if args.bootargs is not None:
     print('Setting boot args: "{}"'.format(args.bootargs))
-    p.kboot_set_bootargs(args.bootargs)
+    p.kboot_set_chosen("bootargs", args.bootargs)
 
 if args.compression != 'none':
     compressed_size = len(payload)

src/kboot.c

@@ -15,11 +15,13 @@
 
 #include "libfdt/libfdt.h"
 
+#define MAX_CHOSEN_PARAMS 16
+
 static void *dt = NULL;
 static int dt_bufsize = 0;
-static char *bootargs = NULL;
 static void *initrd_start = NULL;
 static size_t initrd_size = 0;
+static char *chosen_params[MAX_CHOSEN_PARAMS][2];
 
 #define DT_ALIGN 16384
 
@@ -79,11 +81,15 @@ static int dt_set_chosen(void)
     if (node < 0)
         bail("FDT: /chosen node not found in devtree\n");
 
-    if (bootargs) {
-        if (fdt_setprop(dt, node, "bootargs", bootargs, strlen(bootargs) + 1) < 0)
-            bail("FDT: couldn't set chosen.bootargs property\n");
+    for (int i = 0; i < MAX_CHOSEN_PARAMS; i++) {
+        if (!chosen_params[i][0])
+            break;
 
-        printf("FDT: bootargs = '%s'\n", bootargs);
+        const char *name = chosen_params[i][0];
+        const char *value = chosen_params[i][1];
+        if (fdt_setprop(dt, node, name, value, strlen(value) + 1) < 0)
+            bail("FDT: couldn't set chosen.%s property\n", name);
+        printf("FDT: %s = '%s'\n", name, value);
     }
 
     if (initrd_start && initrd_size) {
@@ -536,18 +542,36 @@ void kboot_set_initrd(void *start, size_t size)
     initrd_size = size;
 }
 
-void kboot_set_bootargs(const char *ba)
+int kboot_set_chosen(const char *name, const char *value)
 {
-    if (bootargs)
-        free(bootargs);
+    int i = 0;
 
-    if (!ba) {
-        bootargs = NULL;
-        return;
+    if (!name)
+        return -1;
+
+    for (int i = 0; i < MAX_CHOSEN_PARAMS; i++) {
+        if (!chosen_params[i][0]) {
+            chosen_params[i][0] = malloc(strlen(name) + 1);
+            strcpy(chosen_params[i][0], name);
+            break;
+        }
+
+        if (!strcmp(name, chosen_params[i][0])) {
+            free(chosen_params[i][1]);
+            chosen_params[i][1] = NULL;
+            break;
+        }
     }
 
-    bootargs = malloc(strlen(ba) + 1);
-    strcpy(bootargs, ba);
+    if (i >= MAX_CHOSEN_PARAMS)
+        return -1;
+
+    if (value) {
+        chosen_params[i][1] = malloc(strlen(value) + 1);
+        strcpy(chosen_params[i][1], value);
+    }
+
+    return i;
 }
 
 int kboot_prepare_dt(void *fdt)

src/kboot.h

@@ -18,7 +18,7 @@ struct kernel_header {
 };
 
 void kboot_set_initrd(void *start, size_t size);
-void kboot_set_bootargs(const char *ba);
+int kboot_set_chosen(const char *name, const char *value);
 int kboot_prepare_dt(void *fdt);
 int kboot_boot(void *kernel);
 

src/payload.c

@@ -160,7 +160,7 @@ static bool check_var(u8 **p)
 
     if (IS_VAR("boot-args=")) {
         *end = 0;
-        kboot_set_bootargs(val);
+        kboot_set_chosen("bootargs", val);
     } else {
         return false;
     }

src/proxy.c

@@ -355,8 +355,8 @@ int proxy_process(ProxyRequest *request, ProxyReply *reply)
             if (kboot_boot((void *)request->args[0]) == 0)
                 return 1;
             break;
-        case P_KBOOT_SET_BOOTARGS:
-            kboot_set_bootargs((void *)request->args[0]);
+        case P_KBOOT_SET_CHOSEN:
+            reply->retval = kboot_set_chosen((void *)request->args[0], (void *)request->args[1]);
             break;
         case P_KBOOT_SET_INITRD:
             kboot_set_initrd((void *)request->args[0], request->args[1]);

src/proxy.h

@@ -90,7 +90,7 @@ typedef enum {
     P_FREE,
 
     P_KBOOT_BOOT = 0x700, // Kernel boot ops
-    P_KBOOT_SET_BOOTARGS,
+    P_KBOOT_SET_CHOSEN,
     P_KBOOT_SET_INITRD,
     P_KBOOT_PREPARE_DT,