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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cc3ae7b0af
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. The advantage in doing so is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h was the source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance for the presence of either and replace as needed. One module.h was converted to moduleparam.h since the file had multiple module_param() in it, and another file had an instance of MODULE_DEVICE_TABLE deleted, since that is a no-op when builtin. Finally, the 32 bit build coverage of olpc_ofw revealed a couple implicit includes, which were pretty self evident to fix based on what gcc was complaining about. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160714001901.31603-6-paul.gortmaker@windriver.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/spinlock_types.h>
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#include <linux/init.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/cpufeature.h>
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#include <asm/special_insns.h>
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#include <asm/pgtable.h>
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#include <asm/olpc_ofw.h>
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/* address of OFW callback interface; will be NULL if OFW isn't found */
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static int (*olpc_ofw_cif)(int *);
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/* page dir entry containing OFW's pgdir table; filled in by head_32.S */
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u32 olpc_ofw_pgd __initdata;
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static DEFINE_SPINLOCK(ofw_lock);
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#define MAXARGS 10
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void __init setup_olpc_ofw_pgd(void)
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{
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pgd_t *base, *ofw_pde;
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if (!olpc_ofw_cif)
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return;
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/* fetch OFW's PDE */
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base = early_ioremap(olpc_ofw_pgd, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
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if (!base) {
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printk(KERN_ERR "failed to remap OFW's pgd - disabling OFW!\n");
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olpc_ofw_cif = NULL;
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return;
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}
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ofw_pde = &base[OLPC_OFW_PDE_NR];
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/* install OFW's PDE permanently into the kernel's pgtable */
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set_pgd(&swapper_pg_dir[OLPC_OFW_PDE_NR], *ofw_pde);
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/* implicit optimization barrier here due to uninline function return */
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early_iounmap(base, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
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}
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int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
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void **res)
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{
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int ofw_args[MAXARGS + 3];
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unsigned long flags;
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int ret, i, *p;
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BUG_ON(nr_args + nr_res > MAXARGS);
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if (!olpc_ofw_cif)
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return -EIO;
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ofw_args[0] = (int)name;
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ofw_args[1] = nr_args;
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ofw_args[2] = nr_res;
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p = &ofw_args[3];
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for (i = 0; i < nr_args; i++, p++)
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*p = (int)args[i];
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/* call into ofw */
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spin_lock_irqsave(&ofw_lock, flags);
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ret = olpc_ofw_cif(ofw_args);
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spin_unlock_irqrestore(&ofw_lock, flags);
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if (!ret) {
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for (i = 0; i < nr_res; i++, p++)
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*((int *)res[i]) = *p;
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(__olpc_ofw);
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bool olpc_ofw_present(void)
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{
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return olpc_ofw_cif != NULL;
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}
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EXPORT_SYMBOL_GPL(olpc_ofw_present);
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/* OFW cif _should_ be above this address */
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#define OFW_MIN 0xff000000
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/* OFW starts on a 1MB boundary */
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#define OFW_BOUND (1<<20)
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void __init olpc_ofw_detect(void)
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{
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struct olpc_ofw_header *hdr = &boot_params.olpc_ofw_header;
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unsigned long start;
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/* ensure OFW booted us by checking for "OFW " string */
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if (hdr->ofw_magic != OLPC_OFW_SIG)
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return;
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olpc_ofw_cif = (int (*)(int *))hdr->cif_handler;
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if ((unsigned long)olpc_ofw_cif < OFW_MIN) {
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printk(KERN_ERR "OFW detected, but cif has invalid address 0x%lx - disabling.\n",
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(unsigned long)olpc_ofw_cif);
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olpc_ofw_cif = NULL;
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return;
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}
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/* determine where OFW starts in memory */
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start = round_down((unsigned long)olpc_ofw_cif, OFW_BOUND);
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printk(KERN_INFO "OFW detected in memory, cif @ 0x%lx (reserving top %ldMB)\n",
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(unsigned long)olpc_ofw_cif, (-start) >> 20);
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reserve_top_address(-start);
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}
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bool __init olpc_ofw_is_installed(void)
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{
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return olpc_ofw_cif != NULL;
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}
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