create area for to save fp regs

refs #421

arch/x86/kernel/cpu.c

@@ -14,6 +14,7 @@
 
 #include <ihk/cpu.h>
 #include <ihk/debug.h>
+#include <ihk/mm.h>
 #include <types.h>
 #include <errno.h>
 #include <list.h>
@@ -984,6 +985,42 @@ int ihk_mc_interrupt_cpu(int cpu, int vector)
 	return 0;
 }
 
+void
+release_fp_regs(struct process *proc)
+{
+	int	pages;
+
+	if (!proc->fp_regs)
+		return;
+	pages = (sizeof(fp_regs_struct) + 4095) >> 12;
+	ihk_mc_free_pages(proc->fp_regs, 1);
+	proc->fp_regs = NULL;
+}
+
+void
+save_fp_regs(struct process *proc)
+{
+	int	pages;
+
+	if (proc->fp_regs)
+		return;
+	pages = (sizeof(fp_regs_struct) + 4095) >> 12;
+	proc->fp_regs = ihk_mc_alloc_pages(pages, IHK_MC_AP_NOWAIT);
+	if(!proc->fp_regs)
+		return;
+	memset(proc->fp_regs, 0, sizeof(fp_regs_struct));
+	// TODO: do xsave
+}
+
+void
+restore_fp_regs(struct process *proc)
+{
+	if (!proc->fp_regs)
+		return;
+	// TODO: do xrstor
+	release_fp_regs(proc);
+}
+
 ihk_mc_user_context_t *lookup_user_context(struct process *proc)
 {
 	ihk_mc_user_context_t *uctx = proc->uctx;

arch/x86/kernel/include/registers.h

@@ -223,4 +223,68 @@ enum x86_pf_error_code {
 	PF_POPULATE	=		1 << 30,
 };
 
+struct i387_fxsave_struct {
+	unsigned short cwd;
+	unsigned short swd;
+	unsigned short twd;
+	unsigned short fop;
+	union {
+		struct {
+			unsigned long rip;
+			unsigned long rdp;
+		};
+		struct {
+			unsigned int fip;
+			unsigned int fcs;
+			unsigned int foo;
+			unsigned int fos;
+		};
+	};
+	unsigned int mxcsr;
+	unsigned int mxcsr_mask;
+	unsigned int st_space[32];
+	unsigned int xmm_space[64];
+	unsigned int padding[12];
+	union {
+		unsigned int padding1[12];
+		unsigned int sw_reserved[12];
+	};
+
+} __attribute__((aligned(16)));
+
+struct ymmh_struct {
+	unsigned int ymmh_space[64];
+};
+
+struct lwp_struct {
+	unsigned char reserved[128];
+};
+
+struct bndreg {
+	unsigned long lower_bound;
+	unsigned long upper_bound;
+} __attribute__((packed));
+
+struct bndcsr {
+	unsigned long bndcfgu;
+	unsigned long bndstatus;
+} __attribute__((packed));
+
+struct xsave_hdr_struct {
+	unsigned long xstate_bv;
+	unsigned long xcomp_bv;
+	unsigned long reserved[6];
+} __attribute__((packed));
+
+struct xsave_struct {
+	struct i387_fxsave_struct i387;
+	struct xsave_hdr_struct xsave_hdr;
+	struct ymmh_struct ymmh;
+	struct lwp_struct lwp;
+	struct bndreg bndreg[4];
+	struct bndcsr bndcsr;
+} __attribute__ ((packed, aligned (64)));
+
+typedef struct xsave_struct fp_regs_struct;
+
 #endif

kernel/include/process.h

@@ -388,6 +388,7 @@ struct process {
 	unsigned long *ptrace_debugreg;	/* debug registers for ptrace */
 	struct sig_pending *ptrace_recvsig;
 	struct sig_pending *ptrace_sendsig;
+	fp_regs_struct *fp_regs;
 };
 
 struct process_vm {

kernel/process.c

@@ -51,6 +51,9 @@ extern void clear_single_step(struct process *proc);
 static void insert_vm_range_list(struct process_vm *vm, 
 		struct vm_range *newrange);
 static int copy_user_ranges(struct process *proc, struct process *org);
+extern void release_fp_regs(struct process *proc);
+extern void save_fp_regs(struct process *proc);
+extern void restore_fp_regs(struct process *proc);
 void settid(struct process *proc, int mode, int newcpuid, int oldcpuid);
 
 int refcount_fork_tree_node(struct fork_tree_node *ftn)
@@ -1974,6 +1977,9 @@ void destroy_process(struct process *proc)
 	if (proc->ptrace_sendsig) {
 		kfree(proc->ptrace_sendsig);
 	}
+	if (proc->fp_regs) {
+		release_fp_regs(proc);
+	}
 	ihk_mc_free_pages(proc, KERNEL_STACK_NR_PAGES);
 }