ia32: add passing of graphmode params via syspage and platformctl

plo can now store graphics mode details in syspage (i.e. after setting the mode via
VESA VBE) that are then accessible from userspace via platformctl

JIRA: RTOS-906

hal/ia32/cpu.c

@@ -568,6 +568,17 @@ int hal_platformctl(void *ptr)
 			}
 			break;
 
+		case pctl_graphmode:
+			if (data->action == pctl_get) {
+				data->graphmode.width = syspage->hs.graphmode.width;
+				data->graphmode.height = syspage->hs.graphmode.height;
+				data->graphmode.bpp = syspage->hs.graphmode.bpp;
+				data->graphmode.pitch = syspage->hs.graphmode.pitch;
+				data->graphmode.framebuffer = syspage->hs.graphmode.framebuffer;
+				return EOK;
+			}
+			break;
+
 		default:
 			break;
 	}

include/arch/ia32/ia32.h

@@ -71,9 +71,11 @@ typedef struct {
 } __attribute__((packed)) pci_dev_t;
 
 
+/* clang-format off */
+
 typedef struct {
 	enum { pctl_set = 0, pctl_get } action;
-	enum { pctl_pci = 0, pctl_busmaster, pctl_reboot } type;
+	enum { pctl_pci = 0, pctl_busmaster, pctl_reboot, pctl_graphmode } type;
 
 	union {
 		struct {
@@ -91,8 +93,18 @@ typedef struct {
 			unsigned int magic;
 			unsigned int reason;
 		} reboot;
+
+		struct {
+			unsigned short width;
+			unsigned short height;
+			unsigned short bpp;
+			unsigned short pitch;
+			unsigned long framebuffer; /* addr_t */
+		} graphmode;
 	};
 } platformctl_t;
 
+/* clang-format on */
+
 
 #endif

include/arch/ia32/syspage.h

@@ -47,6 +47,14 @@ typedef struct {
 	unsigned int hpetLength;
 	unsigned long mcfg; /* addr_t */
 	unsigned int mcfgLength;
+
+	struct {
+		unsigned short width;
+		unsigned short height;
+		unsigned short bpp;
+		unsigned short pitch;
+		unsigned long framebuffer;       /* addr_t */
+	} __attribute__((packed)) graphmode; /* Graphics mode info */
 } __attribute__((packed)) hal_syspage_t;