kernel: introduce per process FPU struct (PFPU) for more flexible machine specific fpu handling

introducing the PFPU structue which allows the machine specific
code some flexibility on how to handle the FPU process state.

for example, in the pc and pc64 kernel, the FPsave structure is
arround 512 bytes. with avx512, it could grow up to 2K. instead
of embedding that into the Proc strucutre, it is more effective
to allocate it on first use of the fpu, as most processes do not
use simd or floating point in the first place. also, the FPsave
structure has special 16 byte alignment constraint, which further
favours dynamic allocation.

this gets rid of the memmoves in pc/pc64 kernels for the aligment.

there is also devproc, which is now checking if the fpsave area
is actually valid before reading it, avoiding debuggers to see
garbage data.

the Notsave structure is gone now, as it was not used on any
machine.

1 files changed, 28 insertions, 26 deletions

diff --git a/sys/src/9/ppc/dat.h b/sys/src/9/ppc/dat.h
index 6589beb44..954ca1f89 100644
--- a/sys/src/9/ppc/dat.h
+++ b/sys/src/9/ppc/dat.h
@@ -1,11 +1,12 @@
 typedef struct Conf	Conf;
+typedef struct Confmem	Confmem;
 typedef struct FPsave	FPsave;
+typedef struct PFPU	PFPU;
 typedef struct ISAConf	ISAConf;
 typedef struct Imap	Imap;
 typedef struct Label	Label;
 typedef struct Lock	Lock;
 typedef struct Mach	Mach;
-typedef struct Notsave	Notsave;
 typedef struct PCArch	PCArch;
 typedef struct PMMU	PMMU;
 typedef struct Page	Page;
@@ -14,6 +15,7 @@ typedef struct Proc	Proc;
 typedef struct Sys	Sys;
 typedef struct Ureg	Ureg;
 typedef struct Vctl	Vctl;
+typedef long		Tval;
 
 #pragma incomplete Ureg
 #pragma incomplete Imap
@@ -46,19 +48,6 @@ struct Label
 };
 
 /*
- * Proc.fpstate
- */
-enum
-{
-	/* Floating point states */
-	FPinit = 0,
-	FPactive = 1,
-	FPinactive = 2,
-	/* Bit that's or-ed in during note handling (FP is illegal in note handlers) */
-	FPillegal = 0x100,
-};
-
-/*
  * This structure must agree with fpsave and fprestore asm routines
  */
 struct FPsave
@@ -73,15 +62,36 @@ struct FPsave
 	};
 };
 
+struct PFPU
+{
+	int	fpstate;
+	FPsave	fpsave[1];
+};
+
+enum
+{
+	/* Floating point states */
+	FPinit = 0,
+	FPactive = 1,
+	FPinactive = 2,
+	/* Bit that's or-ed in during note handling (FP is illegal in note handlers) */
+	FPillegal = 0x100,
+};
+
+struct Confmem
+{
+	ulong	base;
+	ulong	npage;
+	ulong	kbase;
+	ulong	klimit;
+};
+
 struct Conf
 {
 	ulong	nmach;		/* processors */
 	ulong	nproc;		/* processes */
-	ulong	npage0;		/* total physical pages of memory */
-	ulong	npage1;		/* total physical pages of memory */
+	Confmem	mem[2];
 	ulong	npage;		/* total physical pages of memory */
-	ulong	base0;		/* base of bank 0 */
-	ulong	base1;		/* base of bank 1 */
 	ulong	upages;		/* user page pool */
 	ulong	nimage;		/* number of page cache image headers */
 	ulong	nswap;		/* number of swap pages */
@@ -102,14 +112,6 @@ struct PMMU
 	Ureg	*mmureg;		/* pointer to ureg structure */
 };
 
-/*
- *  things saved in the Proc structure during a notify
- */
-struct Notsave
-{
-	ulong	UNUSED;
-};
-
 #include "../port/portdat.h"
 
 /*