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refactor(arm_fpga): move command line code into separate function

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The code dealing with finding the command line and inserting that into
the DTB is somewhat large, and drowns the other DT handlers in our
fpga_prepare_dtb() function.

Move that code into a separate function, to improve readability.

Change-Id: I828203c4bb248d38a2562fcb6afdefedf3179f8d
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2021-09-01 11:54:30 +01:00
parent 49e789e353
commit 52b8f4465e
1 changed files with 57 additions and 48 deletions
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105
plat/arm/board/arm_fpga/fpga_bl31_setup.c
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@ -132,6 +132,57 @@ unsigned int plat_get_syscnt_freq2(void)
FPGA_DEFAULT_TIMER_FREQUENCY);
}
#define CMDLINE_SIGNATURE "CMD:"
static int fpga_dtb_set_commandline(void *fdt, const char *cmdline)
{
int chosen;
const char *eol;
char nul = 0;
int slen, err;
chosen = fdt_add_subnode(fdt, 0, "chosen");
if (chosen == -FDT_ERR_EXISTS) {
chosen = fdt_path_offset(fdt, "/chosen");
}
if (chosen < 0) {
return chosen;
}
/*
* There is most likely an EOL at the end of the
* command line, make sure we terminate the line there.
* We can't replace the EOL with a NUL byte in the
* source, as this is in read-only memory. So we first
* create the property without any termination, then
* append a single NUL byte.
*/
eol = strchr(cmdline, '\n');
if (eol == NULL) {
eol = strchr(cmdline, 0);
}
/* Skip the signature and omit the EOL/NUL byte. */
slen = eol - (cmdline + strlen(CMDLINE_SIGNATURE));
/*
* Let's limit the size of the property, just in case
* we find the signature by accident. The Linux kernel
* limits to 4096 characters at most (in fact 2048 for
* arm64), so that sounds like a reasonable number.
*/
if (slen > 4095) {
slen = 4095;
}
err = fdt_setprop(fdt, chosen, "bootargs",
cmdline + strlen(CMDLINE_SIGNATURE), slen);
if (err != 0) {
return err;
}
return fdt_appendprop(fdt, chosen, "bootargs", &nul, 1);
}
static void fpga_prepare_dtb(void)
{
void *fdt = (void *)(uintptr_t)FPGA_PRELOADED_DTB_BASE;
@ -151,55 +202,13 @@ static void fpga_prepare_dtb(void)
}
/* Check for the command line signature. */
if (!strncmp(cmdline, "CMD:", 4)) {
int chosen;
INFO("using command line at 0x%x\n", FPGA_PRELOADED_CMD_LINE);
chosen = fdt_add_subnode(fdt, 0, "chosen");
if (chosen == -FDT_ERR_EXISTS) {
chosen = fdt_path_offset(fdt, "/chosen");
}
if (chosen < 0) {
ERROR("cannot find /chosen node: %d\n", chosen);
if (!strncmp(cmdline, CMDLINE_SIGNATURE, strlen(CMDLINE_SIGNATURE))) {
err = fpga_dtb_set_commandline(fdt, cmdline);
if (err == 0) {
INFO("using command line at 0x%x\n",
FPGA_PRELOADED_CMD_LINE);
} else {
const char *eol;
char nul = 0;
int slen;
/*
* There is most likely an EOL at the end of the
* command line, make sure we terminate the line there.
* We can't replace the EOL with a NUL byte in the
* source, as this is in read-only memory. So we first
* create the property without any termination, then
* append a single NUL byte.
*/
eol = strchr(cmdline, '\n');
if (!eol) {
eol = strchr(cmdline, 0);
}
/* Skip the signature and omit the EOL/NUL byte. */
slen = eol - (cmdline + 4);
/*
* Let's limit the size of the property, just in case
* we find the signature by accident. The Linux kernel
* limits to 4096 characters at most (in fact 2048 for
* arm64), so that sounds like a reasonable number.
*/
if (slen > 4095) {
slen = 4095;
}
err = fdt_setprop(fdt, chosen, "bootargs",
cmdline + 4, slen);
if (!err) {
err = fdt_appendprop(fdt, chosen, "bootargs",
&nul, 1);
}
if (err) {
ERROR("Could not set command line: %d\n", err);
}
ERROR("failed to put command line into DTB: %d\n", err);
}
}